# Patent

## Title
Pyrazolopurine-based tricyclic compounds and pharmaceutical compositions comprising same

## Abstract

The present invention provides for pyrazolopurine-based tricyclic compounds having the formula (I),




wherein R1, R2, R3, R4, R5 and R6 are as described herein. The present invention further provides pharmaceutical compositions comprising such compounds, as well as the use of such compounds for treating inflammatory and immune diseases.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims the priority benefit of U.S. Provisional Application No. 60/449,770, filed Feb. 25, 2003, which is expressly incorporated fully herein by reference.


FIELD OF THE INVENTION
The present invention relates to pyrazolopurine-based tricyclic compounds, to methods of using the compounds in treating inflammatory diseases, immune diseases, and cancer and to pharmaceutical compositions comprising same.
BACKGROUND OF THE INVENTION
Tumor necrosis factor (TNF-α) is a potent cytokine having pro-inflammatory properties that is released by many cell types when stimulated. Studies have shown a relationship between elevated levels of TNF-α and a variety of diseases such as septic shock, hematopoiesis, tumors, and inflammatory disorders of the central nervous system, including HIV encephalitis, cerebral malaria, and meningitis. Certain neurodegenerative diseases such as Alzheimer's disease, Parkinson's disease, and Creutzfeldt-Jacob disease also are reportedly associated with enhanced TNF-α levels. See, e.g., Arvin et al., “The Role of Inflammation and Cytokines in Brain Injury,” Neuroscience and Biobehavioral Reviews, Vol. 20, No. 3 (1996), at pp. 445-452.
Accordingly, various classes of drugs have been researched and developed to inhibit TNF-α production at both transcriptional and translational levels, e.g., corticosteroids, rolipram (a phosphodiesterase IV inhibitor suppressing TNF-α mRNA synthesis), calphostin, and imidazole-type cytokine suppressing anti-inflammatory drugs (CSAIDs). These drugs are useful in treating a variety of diseases. See Dinarello, “Role of Pro-and Anti-Inflammatory Cytokines During Inflammation: Experimental and Clinical Findings, Review, Vol. 0393-974X (1997), at pp. 91-103.
Recently, attention has focussed on the role of Nuclear factor κB (NF-κB) in the activation pathway that leads to production of TNF-α and other inflammatory cytokines and gene types. Besides TNF-α, NF-κB is involved in the regulation of a variety of genes involved in immune function and inflammation, including IL-2, IL-6, IL-8, IL-2Rα, GM-GSF, intercellular adhesion molecule (ICAM-1), and vascular cellular adhesion molecule-1 (VCAM-1). Thus, inhibition of NF-κB and/or its activation pathway provides a means for treating various diseases including autoimmune diseases, Alzheimer's disease, atherosclerosis, oncogenesis, and so forth. See, e.g., Baldwin, “The NF-κB and I κB Proteins: New Discoveries and Insights,” Annual Rev. Imnunol., Vol. 14 (1996), at pp. 649-81; see also Christman et al., “Impact of Basic Research on Tomorrow's Medicine, The Role of Nuclear Factor-κB in Pulmonary Diseases,” Chest, Vol. 117 (2000), at pp. 1482-87.
Additionally attention has focussed on inhibition of NF-κB and/or its activation pathway to provide a means for treating cancer. Genes which mediate either tumorigenesis or tumor metastasis are regulated by NF-κB. In addition NF-κB is know to be activated by carcinogens and tumor promotors. See e.g., Karin et al.; “NF-κB in Cancer: From Innocent Bystander to Major Culprit,” Nature Rev. Cancer., Vol. 2 (2002) at pp. 301-310; see also Bharti et al.; “Nuclear factor-kappa B and cancer: its role in prevention and therapy” in Biochem. Pharmocol. at pp. 883-888.
Potential inhibitors of the NF-κB and/or the NF-κB pathway have been identified as including Interleukin-10, glucocorticoids, salicylates, nitric oxide, and other immunosuppressants. IκB is a cytoplasmic protein that controls NF-κB activity by retaining NF-κB in the cytoplasm. IκB is phosphorylated by the IκB kinase (IKK), which has two isoforms, IKK-α (“IKK-1”) and IKK-β (“IKK-2”). When IKK phosphorylates IκB, NF-κB is rapidly released from the cytoplasm into the cell. Upon release into the cell, NF-κB translocates to the nucleus where it binds to the promoters of many genes and up-regulates the transcription of pro-inflammatory genes. Glucocorticoids reportedly inhibit NF-κB activity by two mechanisms, i.e., upregulating IκB protein levels and inhibiting NF-κB subunits. Nitric oxide also reportedly inhibits NF-κB through upregulation of IκB. However, these mechanisms of interaction are complex; for example, production of nitric oxide in lymphocytes reportedly enhances NF-κB activity.
As may be appreciated, those in the field of pharmaceutical research continue to seek to develop new compounds and compositions having increased effectiveness, bioavailability, and solubility, having fewer side effects, and/or providing the consumer with a choice of options. Particularly in the area of immune response, many individuals respond differently depending upon the type of treatment and chemical agent used. Mechanisms of action continue to be studied to aid in understanding the immune response and in developing compounds effective for treating inflammatory and immune-related disorders.
The present invention provides pyrazolopurine-based tricyclic compounds useful as inhibitors of IKK.
SUMMARY OF THE INVENTION
The invention is directed to compounds of formula (I), useful in treating inflammatory or immune conditions:




    
    
        enantiomers, diastereomers, salts, and solvates thereof wherein
    
    
    R1 is
    
        (a) hydrogen, or
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1, Z2 and Z3;
    
    
    R2 is
    
        (a) hydrogen, halo, cyano,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, alkoxy, cycloalkoxy, heterocyclooxy, aryloxy, heteroaryloxy, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1a, Z2a and Z3a; or
        (c) —OR10a, —SR10a, or —SO2R10a 
    
    
    R3 and R4 are independently
    
        (a) hydrogen,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
        (c) —OR11, —NR12R13, —N(R12)C(O)R11, —N(R12)C(O)OR11, —N(R12)SO2R14, or —C(O)NR12R13, —SO2NR12R13, N(R12)C(O)NR12aR13, or —N(R12)SO2NR12aR13; or
        (d) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
    
    
    R5 is
    
        (a) hydrogen, halo, hydroxy, cyano,
        (b) alkyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1c, Z2c and Z3c; or
        (c) —OR7, —C(O)R7, —C(O)OR7, or —NR8R9;
    
    
    R6 is
    
        (a) hydrogen, hydroxy, halo, or cyano,
        (b) alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclo, aryl, heteroaryl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d; or
        (c) —OR7a, —NR8aR9a, —N(R8a)SO2R10, —N(R8a)SO2NR8bR9b, —N(R8a)C(O)R7a, —N(R8a)C(O)NR8bR9b, —N(R8a)C(O)OR7a, —C(O)R7a, —C(O)OR7a, —OC(O)R7a, —C(O)NR8aR9a, or —OC(O)NR8aR9a;
    
    
    R7, R7a and R7b are independently
    
        (a) hydrogen, or
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1c, Z2c and Z3c;
    
    
    R8, R8a, R8b, R9 R9a and R9b are independently
    
        (a) hydrogen,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z1d; or
        (c) —OR7b, —NR8cR9c, —N(R8c)SO2R10b, —N(R8c)C(O)R7b, —N(R8c)C(O)OR7b, —SO2NR8cR9c, —SO2R10b, —C(O)R7b, —C(O)OR7b, or —C(O)NR8cR9c;
    
    
    R8c and R9c are independently
    
        (a) hydrogen,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;
    
    
    R10, R10a and R10b are independently alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;
    R11, R12, R12a and R13 are independently
    
        (a) hydrogen, or
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1e, Z2e and Z3e;
    
    
    R14 is alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1e, Z2e and Z3e;
    Z1-1e, Z2-2e, and Z3-3e are optional substituents independently selected from
    
        (1) Y, where Y is
        
            (i) alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocylco)alkyl, heteroaryl, or (heteroaryl)alkyl;
            (ii) a group (i) which is itself substituted by one or more of the same or different groups (i); or
            (iii) a group (i) or (ii) which is independently substituted by one or more (preferably 1 to 3) of the following groups (2) to (13) of the definition of Z1,
        
        
        (2) —OH or —OY,
        (3) —SH or —SY,
        (4) —C(O)tH, —C(O)tY, or —O—C(O)Y, where t is 1 or 2,
        (5) —SO3H, or —S(O)tY,
        (6) halo,
        (7) cyano,
        (8) nitro,
        (9) —U1—NY2Y3,
        (10) —U1—N(Y1)—U2—NY2Y3,
        (11) —U1—N(Y1)—U2—Y,
        (12) —U1—N(Y4)—U2—H,
        (13) oxo;
    
    
    U1 and U2 are each independently
    
        (1) a single bond,
        (2) —U3—S(O)t—U4—,
        (3) —U3—C(O)—U4—,
        (4) —U3—C(S)—U4—,
        (5) —U3—O—U4—,
        (6) —U3—S—U4—,
        (7) —U3—O—C(O)—U4—,
        (8) —U3—C(O)—O—U4—, or
        (9) —U3—C(═NV1a)—U4—;
    
    
    Y1, Y1, Y2, Y3 and Y4 
    
        (1) are each independently hydrogen or a group provided in the definition of Z1; or
        (2) Y2 and Y3 may together be alkylene or alkenylene, completing a 3- to 8-membered saturated or unsaturated ring together with the atoms to which they are attached, which ring is unsubstituted or substituted with one or more groups listed in the definition of Z1, or
        (3) Y2 or Y3, together with Y1, may be alkylene or alkenylene completing a 3- to 8-membered saturated or unsaturated ring together with the nitrogen atoms to which they are attached, which ring is unsubstituted or substituted with one or more groups listed in the definition of Z1, or
        (4) Y2 and Y3 together with the nitrogen atom to which they are attached may combine to form a group —N═CY5Y6 where Y5 and Y6 are each independently H or a group provided in the definition of Y; and
    
    
    U3 and U4 are each independently
    
        (1) a single bond,
        (2) alkylene,
        (3) alkenylene, or
        (4) alkynylene.
    
    


In another embodiment of the invention, the present invention is directed to a compound of formula (I),




    
    
        enantiomers, diastereomers, salts, and solvates thereof wherein
    
    
    R1 is
    
        (a) hydrogen, or
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1, Z2 and Z3;
    
    
    R2 is
    
        (a) hydrogen, halo, cyano,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, alkoxy, cycloalkoxy, heterocyclooxy, aryloxy, heteroaryloxy, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1a, Z2a and Z3a; or
        (c) —OR10a, —SR10a, or —SO2R10a 
    
    
    R3 and R4 are independently
    
        (a) hydrogen,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
        (c) —OR11, —NR12R13, —N(R12)C(O)R11, —N(R12)C(O)OR11, —N(R12)SO2R14, or —C(O)NR12R13, —SO2NR12R13, —N(R12)C(O)NR12aR13, or —N(R12)SO2NR12aR13; or
        (d) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
    
    
    R5 is
    
        (a) hydrogen, halo, hydroxy, cyano,
        (b) alkyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1c, Z2c, and Z3c; or
        (c) —OR7, —C(O)R7, —C(O)OR7, or —NR8R9;
    
    
    R6 is
    
        (a) hydrogen, hydroxy, halo, or cyano,
        (b) alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclo, aryl, heteroaryl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d; or
        (c) —OR7a, —NR8aR9a, —N(R8a)SO2R10, —N(R8a)SO2NR8bR9b, —N(R8aC(O)NR8bR9b, —N(R8a)C(O)OR7a, —C(O)R7a, —C(O)OR7a, —OC(O)R7a, —C(O)NR8aR9a, or —OC(O)NR8aR9a;
    
    
    R7, R7a and R7b are independently
    
        (a) hydrogen, or
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1c, Z2c and Z3c;
    
    
    R8, R8a, R8b, R9 R9a and R9b are independently
    
        (a) hydrogen,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z1d; or
        (c) —OR7b, —NR8cR9c, —N(R8c)SO2R10b, —N(R8c)C(O)R7b, —N(R8c)C(O)OR7b, —SO2NR8cR9c, —SO2R10b, —C(O)R7b, —C(O)O7b, or —C(O)NR8cR9c;
    
    
    R8c and R9c are independently
    
        (a) hydrogen,
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;
    
    
    R10, R10a and R10b are independently alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;
    R11, R12, R12a and R13 are independently
    
        (a) hydrogen, or
        (b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1e, Z2e and Z3e;
    
    
    R14 is alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1e, Z2e and Z3e;
    Z1-1e, Z2-2e, and Z3-3e are optional substituents independently selected from
    
        (1) Y, where Y is
        
            (i) alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl;
            (ii) a group (i) which is itself substituted by one or more of the same or different groups (i); or
            (iii) a group (i) or (ii) which is independently substituted by one or more (preferably 1 to 3) of the following groups (2) to (13) of the definition of Z1,
        
        
        (2) —OH or —OY1,
        (3) —SH or —SY1,
        (4) —C(O)tH, —C(O)tY1, or —O—C(O)Y1, where t is 1 or 2,
        (5) —SO3H, or —S(O)tY1,
        (6) halo,
        (7) cyano,
        (8) nitro,
        (9) —U1—NY2Y3,
        (10) —U1—N(Y1)—U2—NY2Y3,
        (11) —U1—N(Y4)—U2—Y1,
        (12) —U1—N(Y4)—U2—H,
        (13) oxo;
    
    
    U1 and U2 are each independently
    
        (1) a single bond,
        (2) —U3—S(O)t—U4—,
        (3) —U3—C(O)—U4—,
        (4) —U3—C(S)—U4—,
        (5) —U3—O—U4—,
        (6) —U3—S—U4—,
        (7) —U3—O—C(O)—U4—,
        (8) —U3—C(O)—O—U4—, or
        (9) —U3—C(═NV1a)—U4—;
    
    
    V1a is independently hydrogen, alkyl, —CN, —C(O)Y1, —S(O)2Y5, S(O)2NY2Y3;
    Y1, Y2, Y3 and Y4 
    
        (1) are each independently hydrogen or a group provided in
        
            (i) alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl;
            (ii) a group (i) which is itself substituted by one or more of the same or different groups (i),
            (iii) a group (i) or (ii) which is independently substituted by one or more (preferably 1 to 3) of the following groups (1) to (12) of the definition of Z4, or
        
        
        (2) Y2 and Y3 may together be alkylene or alkenylene, completing a 3- to 8-membered saturated or unsaturated ring together with the atoms to which they are attached, which ring is unsubstituted or substituted with one or more groups selected from alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl, or
        (3) Y2 or Y3, together with Y1, may be alkylene or alkenylene completing a 3- to 8-membered saturated or unsaturated ring together with the nitrogen atoms to which they are attached, which ring is unsubstituted or substituted with one or more groups selected from alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl, or
        (4) Y2 and Y3 together with the nitrogen atom to which they are attached may combine to form a group —N═CY5Y6 where Y5 and Y6 are each independently H or a group provided selected from alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl; and
    
    
    Z4 is
    
        (1) —OH or OYa,
        (2) —SH or —SYa,
        (3) —C(O)tH, —C(O)tYa, or —O—C(O)Ya, where t is 1 or 2,
        (4) —SO3H, or —S(O)tYa,
        (5) halo,
        (6) cyano,
        (7) nitro,
        (8) —U1—NYbYc,
        (9) —U1—N(Y1)—U2—NYbYc,
        (10) —U1—N(Yd)—U2—Ya,
        (11) —U1—N(Yd)—U2—H,
        (12) oxo;
    
    
    Ya, Yb, Yc and Yd 
    
        (1) are each independently hydrogen or a group provided in
        
            (i) alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl;
        
        
    
    
    U3 and U4 are each independently
    
        (1) a single bond,
        (2) alkylene,
        (3) alkenylene, or
        (4) alkynylene.
    
    


The invention also relates to pharmaceutical compositions containing at least one compound of formula (I) and a pharmaceutically-acceptable carrier or diluent, for use in treating inflammatory and immune diseases. Also included within the invention are methods of treating such diseases comprising administering to a mammal in need of such treatment an effective amount of at least one compound of formula (I).


DETAILED DESCRIPTION OF THE INVENTION
The following are definitions of terms used in this specification. The initial definition provided for a group or term herein applies to that group or term throughout the present specification, individually or as part of another group, unless otherwise indicated.
The term “alkyl” as used herein by itself or as part of another group refers to straight and branched chain hydrocarbons, containing 1 to 20 carbons, preferably 1 to 10 carbons, more preferably 1 to 8 carbons, such as methyl, ethyl, propyl, isopropyl, butyl, t-butyl, isobutyl, pentyl, hexyl, isohexyl, heptyl, 4,4-dimethylpentyl, octyl, 2,2,4-trimethylpentyl, nonyl, decyl, undecyl, dodecyl, the various branched chain isomers thereof, and the like. Lower alkyl groups, that is, alkyl groups of 1 to 4 carbon atoms, are often most preferred.
The term “alkenyl” as used herein by itself or as part of another group refers to straight or branched chain radicals of 2 to 20 carbons, preferably 2 to 12 carbons, and more preferably 1 to 8 carbons in the normal chain, which include one to six double bonds in the normal chain, such as vinyl, 2-propenyl, 3-butenyl, 2-butenyl, 4-pentenyl, 3-pentenyl, 2-hexenyl, 3-hexenyl, 2-heptenyl, 3-heptenyl, 4-heptenyl, 3-octenyl, 3-nonenyl, 4-decenyl, 3-undecenyl, 4-dodecenyl, 4,8,12-tetradecatrienyl, and the like.
The term “alkynyl” as used herein by itself or as part of another group refers to straight or branched chain hydrocarbon groups having 2 to 12 carbon atoms, preferably 2 to 4 carbon atoms, and at least one triple carbon to carbon bond, such as ethynyl, 2-propynyl, 3-butynyl, 2-butynyl, 4-pentynyl, 3-pentynyl, 2-hexynyl, 3-hexynyl, 2-heptynyl, 3-heptynyl, 4-heptynyl, 3-octynyl, 3-nonynyl, 4-decynyl, 3-undecynyl, 4-dodecynyl and the like.
When the term “alkyl” is used together with another group, such as in “(aryl)alkyl”, this conjunction is meant to refer to a substituted alkyl group wherein at least one of the substituents is the specifically named group in the conjunction. For example, “(aryl)alkyl” refers to a substituted alkyl group as defined above wherein at least one of the substituents is an aryl, such as benzyl.
Where alkyl groups as defined above have single bonds for attachment to two other groups, they are termed “alkylene” groups. Similarly, where alkenyl groups as defined above and alkynyl groups as defined above, respectively, have single bonds for attachment to two other groups, they are termed “alkenylene groups” and “alkynylene groups” respectively. Examples of alkylene, alkenylene and alkynylene groups include:




and the like. Alkylene groups may be optionally independently substituted as valence allows with one or more groups provided in the definition of Z1.

The term “cycloalkyl” as used herein by itself or as part of another group refers to saturated and partially unsaturated (containing 1 or 2 double bonds) cyclic hydrocarbon groups containing 1 to 3 rings, including monocyclicalkyl, bicyclicalkyl and tricyclicalkyl, containing a total of 3 to 20 carbons forming the rings, preferably 3 to 7 carbons, forming the ring. The rings of multi-ring cycloalkyls may be either fused, bridged and/or joined through one or more spiro union to 1 or 2 aromatic, cycloalkyl or heterocyclo rings. Exemplary cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclodecyl, cyclododecyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl, cyclohexadienyl, cycloheptadienyl,




and the like.

The term “cycloalkylene” as employed herein refers to a “cycloalkyl” group which includes free bonds and thus is a linking group such as




and the like.

One skilled in the field will understand that, when the designation “CO2” is used herein, this is intended to refer to the group




The term “alkoxy” refers to an alkyl or substituted alkyl group as defined above bonded through an oxygen atom (—O—), i.e., the groups —ORd, wherein Rd is alkyl or substituted alkyl.
The term “alkylthio” refers to an alkyl or substituted alkyl group as defined above bonded through a sulfur atom (—S—), i.e., the groups —SRd, wherein Rd is alkyl or substituted alkyl.
The term “acyl” refers to a carbonyl group linked to an organic radical, more particularly, the group C(═O)Rg, wherein Rg can be selected from alkyl, alkenyl, substituted alkyl, or substituted alkenyl, as defined herein.
The term “alkoxycarbonyl” refers to a carboxy group




linked to an organic radical (CO2Rg), wherein Rg is as defined above for acyl.

The term “halo” or “halogen” refers to chloro, bromo, fluoro and iodo.
The term “haloalkyl” means a substituted alkyl having one or more halo substituents. For example, “haloalkyl” includes mono, bi, and trifluoromethyl.
The term “haloalkoxy” means an alkoxy group having one or more halo substituents. For example, “haloalkoxy” includes OCF3.
The terms “ar” or “aryl” as used herein by itself or as part of another group refer to aromatic homocyclic (i.e., hydrocarbon) monocyclic, bicyclic or tricyclic aromatic groups containing 6 to 14 carbons in the ring portion (such as phenyl, biphenyl, naphthyl (including 1-naphthyl and 2-naphthyl) and antracenyl) and may optionally include one to three additional rings (either cycloalkyl, heterocyclo or heteroaryl) fused thereto. Examples include:




and the like.

The term “heteroaryl” as used herein by itself or as part of another group refers to monocyclic and bicyclic aromatic rings containing from 5 to 10 atoms, which includes 1 to 4 hetero atoms such as nitrogen, oxygen or sulfur, and such rings fused to an aryl, cycloalkyl, heteroaryl or heterocyclo ring, where the nitrogen and sulfur heteroatoms may optionally be oxidized and the nitrogen heteroatoms may optionally be quaternized. Examples of heteroaryl groups include pyrrolyl, pyrazolyl, pyrazolinyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, thiadiazolyl, isothiazolyl, furanyl, thienyl, oxadiazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, indolyl, benzothiazolyl, benzodioxolyl, benzoxazolyl, benzothienyl, quinolinyl, tetrahydroisoquinolinyl, isoquinolinyl, benzimidazolyl, benzopyranyl, indolizinyl, benzofuranyl, chromonyl, coumarinyl, benzopyranyl, cinnolinyl, quinoxalinyl, indazolyl, pyrrolopyridyl, furopyridyl, dihydroisoindolyl, tetrahydroquinolinyl, carbazolyl, benzidolyl, phenanthrollinyl, acridinyl, phenanthridinyl, xanthenyl




and the like.

In compounds of formula (I), preferred heteroaryl groups include




and the like, which optionally may be substituted at any available carbon or nitrogen atom.

The terms “heterocyclic” or “heterocyclo” as used herein by itself or as part of another group refer to optionally substituted, fully saturated or partially unsaturated cyclic groups (for example, 3 to 13 member monocyclic, 7 to 17 member bicyclic, or 10 to 20 member tricyclic ring systems, preferably containing a total of 3 to 10 ring atoms) which have at least one heteroatom in at least one carbon atom-containing ring. Each ring of the heterocyclic group containing a heteroatom may have 1, 2, 3 or 4 heteroatoms selected from nitrogen atoms, oxygen atoms and/or sulfur atoms, where the nitrogen and sulfur heteroatoms may optionally be oxidized and the nitrogen heteroatoms may optionally be quaternized. The heterocyclic group may be attached at any heteroatom or carbon atom of the ring or ring system, where valance allows. The rings of multi-ring heterocycles may be either fused, bridged and/or joined through one or more spiro unions. Exemplary heterocyclic groups include azetidinyl, pyrrolidinyl, oxetanyl, imidazolinyl, oxazolidinyl, isoxazolinyl, thiazolidinyl, isothiazolidinyl, tetrahydrofuranyl, piperidinyl, piperazinyl, 2-oxopiperazinyl, 2-oxopiperidinyl, 2-oxopyrrolodinyl, 2-oxoazepinyl, azepinyl, 4-piperidonyl, tetrahydropyranyl, morpholinyl, thiamorpholinyl, thiamorpholinyl sulfoxide, thiamorpholinyl sulfone, 1,3-dioxolane and tetrahydro-1,1-dioxothienyl,




and the like.

Preferred heterocyclo groups in compounds of formula (I) include




which optionally may be substituted.

The term “ring” encompasses homocyclic (i.e., as used herein, all the ring atoms are carbon) or “heterocyclic” (i.e., as used herein, the ring atoms include carbon and one to four heteroatoms selected from N, O and/or S, also referred to as heterocyclo), where, as used herein, each of which (homocyclic or heterocyclic) may be saturated or partially or completely unsaturated (such as heteroaryl).
Unless otherwise indicated, when reference is made to a specifically-named aryl (e.g., phenyl), cycloalkyl (e.g., cyclohexyl), heterocyclo (e.g., pyrrolidinyl) or heteroaryl (e.g., imidazolyl), unless otherwise specifically indicated the reference is intended to include rings having 0 to 3, preferably 0 to 2, substituents selected from those recited above for the aryl, cycloalkyl, heterocyclo and/or heteroaryl groups, as appropriate.
The term “heteroatoms” shall include oxygen, sulfur and nitrogen.
The term “carbocyclic” means a saturated or unsaturated monocyclic or bicyclic ring in which all atoms of all rings are carbon. Thus, the term includes cycloalkyl and aryl rings. The carbocyclic ring may be substituted in which case the substituents are selected from those recited above for cycloalkyl and aryl groups.
When the term “unsaturated” is used herein to refer to a ring or group, the ring or group may be fully unsaturated or partially unsaturated.
Throughout the specification, groups and substituents thereof may be chosen by one skilled in the field to provide stable moieties and compounds and compounds useful as pharmaceutically-acceptable compounds and/or intermediate compounds useful in making pharmaceutically-acceptable compounds. One skilled in the field may make the appropriate selections for B and X to provide stable compounds.
The compounds of formula I form salts which are also within the scope of this invention. Reference to a compound of the formula I herein is understood to include reference to salts thereof, unless otherwise indicated. The term “salt(s)”, as employed herein, denotes acidic and/or basic salts formed with inorganic and/or organic acids and bases. In addition, when a compound of formula I contains both a basic moiety, such as, but not limited to an amine or a pyridine ring, and an acidic moiety, such as, but not limited to a carboxylic acid, zwitterions (“inner salts”) may be formed and are included within the term “salt(s)” as used herein. Pharmaceutically acceptable (i.e., non-toxic, physiologically acceptable) salts are preferred, although other salts are also useful, e.g., in isolation or purification steps which may be employed during preparation. Salts of the compounds of the formula I may be formed, for example, by reacting a compound of the formula I with an amount of acid or base, such as an equivalent amount, in a medium such as one in which the salt precipitates or in an aqueous medium followed by lyophilization.
Exemplary acid addition salts include acetates (such as those formed with acetic acid or trihaloacetic acid, for example, trifluoroacetic acid), adipates, alginates, ascorbates, aspartates, benzoates, benzenesulfonates, bisulfates, borates, butyrates, citrates, camphorates, camphorsulfonates, cyclopentanepropionates, digluconates, dodecylsulfates, ethanesulfonates, fumarates, glucoheptanoates, glycerophosphates, hemisulfates, heptanoates, hexanoates, hydrochlorides (formed with hydrochloric acid), hydrobromides (formed with hydrogen bromide), hydroiodides, 2-hydroxyethanesulfonates, lactates, maleates (formed with maleic acid), methanesulfonates (formed with methanesulfonic acid), 2-naphthalenesulfonates, nicotinates, nitrates, oxalates, pectinates, persulfates, 3-phenylpropionates, phosphates, picrates, pivalates, propionates, salicylates, succinates, sulfates (such as those formed with sulfuric acid), sulfonates (such as those mentioned herein), tartrates, thiocyanates, toluenesulfonates such as tosylates, undecanoates, and the like.
Exemplary basic salts include ammonium salts, alkali metal salts such as sodium, lithium, and potassium salts, alkaline earth metal salts such as calcium and magnesium salts, salts with organic bases (for example, organic amines) such as benzathines, dicyclohexylamines, hydrabamines [formed with N,N-bis(dehydro-abietyl)ethylenediamine], N-methyl-D-glucamines, N-methyl-D-glucamides, t-butyl amines, and salts with amino acids such as arginine, lysine and the like. Basic nitrogen-containing groups may be quaternized with agents such as lower alkyl halides (e.g., methyl, ethyl, propyl, and butyl chlorides, bromides and iodides), dialkyl sulfates (e.g., dimethyl, diethyl, dibutyl, and diamyl sulfates), long chain halides (e.g., decyl, lauryl, myristyl and stearyl chlorides, bromides and iodides), aralkyl halides (e.g., benzyl and phenethyl bromides), and others.
Compounds of the formula I, and salts thereof, may exist in their tautomeric form, in which hydrogen atoms are transposed to other parts of the molecules and the chemical bonds between the atoms of the molecules are consequently rearranged. It should be understood that all tautomeric forms, insofar as they may exist, are included within the invention. Additionally, inventive compounds may have trans and cis isomers and may contain one or more chiral centers, therefore existing in enantiomeric and diastereomeric forms. The invention includes all such isomers, as well as mixtures of cis and trans isomers, mixtures of diastereomers and racemic mixtures of enantiomers (optical isomers). When no specific mention is made of the configuration (cis, trans or R or S) of a compound (or of an asymmetric carbon), then any one of the isomers or a mixture of more than one isomer is intended. The processes for preparation can use racemates, enantiomers, or diastereomers as starting materials. When enantiomeric or diastereomeric products are prepared, they can be separated by conventional methods, for example, by chromatographic or fractional crystallization. The inventive compounds may be in the free or hydrate form.
In addition, compounds of formula I may have prodrug forms. Any compound that will be converted in vivo to provide the bioactive agent (i.e., a compound of formula I) is a prodrug within the scope and spirit of the invention.
For example, pro-drug compounds of formula I may be carboxylate ester moieties. A carboxylate ester may be conveniently formed by esterifying any of the carboxylic acid functionalities found on the disclosed ring structure(s). Various forms of prodrugs are well known in the art. For examples of such prodrug derivatives, see:

    
    
        a) Design of Prodrugs, edited by H. Bundgaard, (Elsevier, 1985), and Methods in Enzymology, Vol. 42, at pp. 309-396, edited by K. Widder, et. al. (Academic Press, 1985);
        b) A Textbook of Drug Design and Development, edited by Krosgaard-Larsen and H. Bundgaard, Chapter 5, “Design and Application of Prodrugs,” by H. Bundgaard, at pp. 113-191 (1991);
        c) H. Bundgaard, Advanced Drug Delivery Reviews, Vol. 8, p. 1-38 (1992);
        d) H. Bundgaard, et al., Journal of Pharmaceutical Sciences, Vol. 77, p. 285 (1988); and
        e) N. Kakeya, et. al., Chem Phar Bull, Vol. 32, p. 692 (1984).
    
    


It should further be understood that solvates (e.g., hydrates) of the compounds of formula I are also with the scope of the present invention. Methods of solvation are generally known in the art.
“Therapeutically effective amount” is intended to include an amount of a compound of the present invention alone or an amount of the combination of compounds claimed or an amount of a compound of the present invention in combination with other active ingredients effective to inhibit or suppress IKK or effective to treat inflammatory disorders, immune disorder, or cancer.
As used herein, “treating” or “treatment” cover the treatment of a disease-state in a mammal, particularly in a human, and include: (a) preventing the disease-state from occurring in a mammal, in particular, when such mammal is predisposed to the disease-state but has not yet been diagnosed as having it; (b) inhibiting the disease-state, i.e., arresting it development; and/or (c) relieving the disease-state, i.e., causing regression of the disease state.
METHODS OF PREPARATION
The inventive compounds may be prepared by methods such as those illustrated in the following Schemes 1 to 3. Starting materials are commercially available or can be readily prepared by one of ordinary skill in the art, and/or modifications can be made to the methods of Schemes 1 to 3 by one skilled in the art, using known methods. For all of the schemes and compounds, the groups R1, R2, R3, R4, R5 and R6 are as described herein for a compound of formula I, unless otherwise indicated, and appropriate starting materials may be selected by one skilled in the field having the desired groups. Solvents, temperatures, pressures, and other reaction conditions may readily be selected as appropriate by one of ordinary skill in the art. For example, in these schemes chlorinating agents may include phosphorous oxychloride, catalytic agents may include metals such as Pd, and solvents may be selected from 1,2-dichlorobenzene, methylene chloride, DMF, alcohols, ethers, THF, dioxane, acetonitrile, water, mixtures of ethers and water, and the like.
“Cross-coupling” or coupling reactions as used in the schemes and examples may include all cross-coupling methods known by those skilled in the art. Such methods include Stille-type coupling (reacting a vinyl or aromatic triflate, bromide or iodide with a tin), Suzuki-type coupling (reacting a zinc, magnesium or boronate derivative catalyzed by palladium(0), palladium(II), nickel(0) or nickel(II)), Heck coupling, and Sonogashira coupling. Copper iodide, lithium chloride, zinc chloride, triphenylarsine, tris(2-furyl)phosphine or tris(2,4,6-trimethoxyphenyl)-phosphine advantageously may also be added. When a boronic acid derivative is used, the reaction may proceed in the presence of an inorganic base such as sodium carbonate or potassium phosphate or carbonate. The cross-coupling reactions are performed in an inert organic solvent.



















Key intermediate VII may be prepared from commercially available ethyl 2-mercaptoimidazole-4-carboxylate, II, as shown in Scheme 1. The mercapto group is first methylated to give III, followed by N-alkylation to give IV, wherein R1 is alkyl. IV is transesterified to give V, which is chlorinated to give VI followed by oxidation to give VII. Alternatively, compound V may be prepared through intermediate XIX, as shown in Scheme 1a.
The synthesis of final compounds I, wherein R6 is optionally substituted phenyl, is shown in Scheme 2. 3-Amino-5-phenylpyrazole VIII is condensed with VII to give pyrazolo-purine IX. The methanesulfonyl group of IX is reduced off to give X and the carbonyl group of X is activated by conversion to trifluoromethanesulfonate XI. XI is then converted to I by condensation with appropriate amines.
A more versatile synthetic route is shown in Scheme 3. Pyrazole XII is protected as the tri-isopropylsilyl ether XIII, which is condensed with intermediate VII to give pyrazolopurine XIV. The methanesulfonyl group of XIV is removed by reduction to give XV, and the silyl group is removed to give XVI, which is activated to the di-trifluoromethanesulfonate XVIa. The 4-sulfonate group is replaced with selected amines to give XVII, which is cross-coupled with the desired aryl or heteroaryl stannanes or boronates to give final compounds I.
PREFERRED COMPOUNDS
Preferred compounds within the scope of formula I include compounds wherein

    R1 is hydrogen, alkyl or haloalkyl;
    R2 is hydrogen, halogen, alkyl, haloalkyl;
    R3 and R4 are independently
    
        (a) hydrogen,
        (b) alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl and of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b; or
        (c) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
    
    
    R5 is hydrogen, halogen, alkyl or haloalkyl;
    R6 is
    
        (a) alkyl, alkenyl, alkynyl or aryl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d; or
        (b) —OR7a;
    
    
    R7a is alkyl optionally substituted with Z1c;
    Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —N(Y1)—U2—NY2Y3, —N(Y1)—U2—Y, or —N(Y4)—U2—H;
    Z1c is
    
        (a) —OH, —OY or
        (b) aryl optionally substituted with —OH or —OY;
    
    
    Z1d, Z2d and Z3d are optional substituents independently selected from
    
        (a) cyano, halo, —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —S(O)tY, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y, or —N(Y4)—U2—H;
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —S(O)tY, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y, or —N(Y4)—U2—H.
    
    


More preferred compounds within the scope of formula I include compounds
wherein


    R1 is alkyl;
    R2 is hydrogen;
    R3 is hydrogen;
    R4 is alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl (preferably cyclopropyl), (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl and of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
    R5 is hydrogen;
    R6 is
    
        (a) alkynyl optionally substituted with Z1d where Z1d is aryl which may be further optionally independently substituted with one or more cyano, halo, —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —S(O)tY, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y, or —N(Y4)—U2—H;
        (b) aryl optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d; or
        (c) —OR7a;
    
    
    R7a is alkyl optionally substituted with Z1c;
    Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —N(Y4)—U2—Y, or —N(Y4)—U2—H
    
         where
        
            U1 is a bond,
            U2 is —U3—C(O)—U4— or —U3—C(O)O—U4— and
            U3 and U4 are indepedently a bond or alkylene;
        
        
    
    
    Z1c is
    
        (a) —OY where Y is aryl, or
        (b) aryl optionally substituted with —OH or —OY where Y is alkyl;
    
    
    Z1d, Z2d and Z3d are optional substituents independently selected from
    
        (a) cyano, halo, —OH, —OY, —C(O)tH, —C(O)tY, —S(O)tY, or
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —S(O)tY, —N(Y4)—U2—Y, or —N(Y4)—U2—H
         where
        
            U1 is a bond, or —C(O)—,
            U2 is —U3—C(O)—U4—, —U3—C(O)O—U4—, or —U3—SO2—U4—, and
            U3 and U4 are indepedently a bond or alkylene.
        
        
    
    


Preferred compounds within the scope of formula I include compounds of the following formulae IIa and IIb:




wherein

    R1, R2, R3, R4, and R5 are as defined above in the description of compounds of formula I (including the description of preferred groups);
    Z1d is
    
        (a) cyano, halo, —OH, —OY, —C(O)tH, —C(O)tY, —S(O)tY, or
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —S(O)tY, —N(Y4)—U2—Y, or —N(Y4)—U2—H
         where
        
            U1 is a bond, or —C(O)—,
            U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
            U3 and U4 are indepedently a bond or alkylene; and
        
        
    
    
    Z2d and Z3d are optional substituents independently selected from
    
        (a) cyano, halo, —OH, —OY, —C(O)tH, —C(O)tY, —S(O)tY, or
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY, —U1—NY2Y3, —C(O)tH, —C(O)tY, —S(O)tY, —N(Y4)—U2—Y, or —N(Y4)—U2—H
         where
        
            U1 is a bond, or —C(O)—,
            U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
            U3 and U4 are indepedently a bond or alkylene.
        
        
    
    


In another embodiment of the invention, the invention is directed to a compound of formula (I), wherein

    Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H;
    Z1c is
    
        (a) —OH, —OY1 or
        (b) aryl optionally substituted with —OH or —OY1;
    
    
    Z1d, Z2d and Z3d are optional substituents independently selected from
    
        (a) cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y, or —N(Y4)—U2—H;
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H.
    
    


In another embodiment of the invention, the invention is directed to a compound of formula (I), wherein

    R3 is hydrogen;
    R4 is alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl and of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
    R6 is
    
        (a) alkynyl optionally substituted with Z1d where Z1d is aryl which may be further optionally independently substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H;
        (b) aryl optionally independently substituted as valence allows with one or more Z1d, Z2d an Z3d;
        (c) —OR7a; or
        (d) heterocyclo optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;
    
    
    Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —N(Y4)—U2—Y, or —N(Y4)—U2—H
    
        where
        
            U1 is a bond,
            U2 is —U3—C(O)—U4— or —U3—C(O)O—U4— and
            U3 and U4 are independently a bond or alkylene;
        
        
    
    
    Z1c is
    
        (a) —OY1 where Y1 is aryl, or
        (b) aryl optionally substituted with —OH or —OY1 where Y1 is alkyl;
    
    
    Z1d, Z2d and Z3d are optional substituents independently selected from
    
        (a) cyano, halo, —OH, —OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
         where
        
            U1 is a bond, or —C(O)—,
            U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
            U3 and U4 are indepedently a bond or alkylene.
        
        
    
    


In another embodiment of the invention, the invention is directed to a compound of formula (I), wherein

    R1 is alkyl;
    R2 is hydrogen; and
    R5 is hydrogen or alkyl.


In another embodiment of the invention, the invention is directed to a compound of formula (I), wherein

    Z1d is
    
        (a) cyano, halo, —OH, —OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
         where
        
            U1 is a bond, or —C(O)—,
            U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
            U3 and U4 are indepedently a bond or alkylene; and
        
        
    
    
    Z2d and Z3d are optional substituents independently selected from
    
        (a) cyano, halo, —OH, —OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
        (b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
         where
        
            U1 is a bond, or —C(O)—,
            U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
            U3 and U4 are indepedently a bond or alkylene.
        
        
    
    


In another embodiment of the invention, the invention is directed to a compound of formula (I), wherein

    R3 and R4 are independently
    
        (a) hydrogen,
        (b) alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl and of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b; or
        (c) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b.
    
    


In another embodiment of the invention, the invention is directed to a compound of formula (I), wherein

    
    
        Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H.
    
    


UTILITY
The compounds and compositions of this invention are useful in treating conditions that are characterized by the activity of IKK, release of NF-κB, and/or enhanced levels of TNF-α. The term “treating” or “treatment” denotes prevention, partial alleviation, or cure of the disease or disorder or its symptoms or consequences. Inhibition or suppression of IKK, NF-κB and/or TNF-α may occur locally, for example, within certain tissues of the subject, or more extensively throughout the subject being treated for such a disease. Inhibition or suppression of IKK, NF-κB and/or TNF-α may occur by one or more mechanisms, e.g., by inhibiting or suppressing any step of the pathway(s). The term “NF-κB-associated condition” refers to diseases that are characterized by release of NF-κB from the cytoplasm (e.g., upon phosphorylation of IκB). The term “TNF-α-associated condition” is a condition characterized by enhanced levels of TNF-α. In the instant specification, the term “NF-κB-associated condition” will include a TNF-α-associated condition but is not limited thereto as NF-κB is involved in the activity and upregulation of other pro-inflammatory proteins and genes. The term “inflammatory or immune disease” is used herein to encompass IKK-associated conditions, NF-κB-associated conditions, and TNF-α-associated conditions, e.g., any condition, disease, or disorder that is associated with activity of IKK, NF-κB and/or enhanced levels of TNF-α.
The inventive compounds and compositions are useful for treating a variety of diseases including, but not limited to, treatment of transplant rejections (e.g., kidney, liver, heart, lung, pancreas, bone marrow, cornea, small bowel, skin allografts, skin homografts and heterografts, etc.) or tolerance to organ transplantion; rheumatoid arthritis, psoriatic arthritis, multiple sclerosis, inflammatory bowel disease (such as Crohn's disease and ulcerative colitus); antiviral and autoimmune diseases including herpes simplex type 1 (HSV-1), herpes simplex type 2 (HSV-2), cytomegalovirus, Epstein-Barr, human immunodeficiency virus (HIV), Addison's disease (autoimmune disease of the adrenal glands), idiopathic adrenal insufficiency, and autoimmune polyglandular disease (also known as autoimmune polyglandular syndrome); Alzheimer's, Parkinson's, and Creutzfeldt-Jacob diseases; septic shock; hematopoiesis; inflammatory diseases such as osteoarthritis, acute pancreatitis, and chronic pancreatitis; inflammatory disorders of the central nervous system, including HIV encephalitis, cerebral malaria, and meningitis, atherosclerosis, and ataxia telangiectasis; respiratory allergies including asthma, hayfever, and allergic rhinitis; fungal infections such as mycosis fungoides; and psoriasis, glomerulonephritis, serum sickness, lupus (systematic lupus erythematosis), urticaria, scleraclerma, contact dermatitis, dermatomyositis, alopecia, atopic eczemas, and ichthyosis. The term “inflammatory or immune disease” as used herein includes all of the above-referenced diseases and disorders.
The inventive compounds are also effective in treating oncological diseases, in treating cancer and tumors, such as solid tumors, lymphomas and leukemia, and in particular, breast cancer, prostate cancer, and Hodgkin's lymphoma.
Additionally this invention relates to a pharmaceutical composition of a compound of formula I, or pharmaceutically acceptable salt or hydrate thereof, and a pharmaceutically acceptable carrier in the treatment of hyperproliferative disorder in mammal. In particular, the said pharmaceutical composition is expected to inhibit the growth of those primary and recurrent solid or liquid tumors which are associated with IKK, especially those tumors which are significantly dependent on IKK for their growth and spread, including for example, hematopoietic tumors, cancers of the bladder, squamous cell, head, colorectal, oesophageal, gynecological (such as ovarian), pancreas, breast, prostate, lung, vulva, skin, brain, genitourinary tract, lymphatic system (such as thyroid), stomach, larynx and lung.
More specifically, the compounds of formula I are useful in the treatment of a variety of cancers, including (but not limited to) the following:

    
    
        carcinoma, including that of the bladder, breast, colon, kidney, liver, lung, including small cell lung cancer, esophagus, gall bladder, ovary, pancreas, stomach, cervix, thyroid, prostate, and skin, including squamous cell carcinoma;
        tumors of the skin, including melanoma;
        hematopoietic tumors including those of lymphoid lineage, including leukemia, acute lymphocytic leukemia, acute lymphoblastic leukemia, B-cell lymphoma, T-cell lymphoma, Hodgkins lymphoma, non-Hodgkins lymphoma, hairy cell lymphoma and Burkett's lymphoma;
        hematopoietic tumors of myeloid lineage, including acute and chronic myelogenous leukemias, myelodysplastic syndrome and promyelocytic leukemia;
        hematopoietic tumors including those of plasma cell lineage such as multiple myeloma;
        tumors of mesenchymal origin, including fibrosarcoma and rhabdomyosarcoma;
        tumors of the central and peripheral nervous system, including astrocytoma, neuroblastoma, glioma and schwannomas; and
        other tumors, including melanoma, seminoma, teratocarcinoma, osteosarcoma, xenoderoma pigmentosum, keratoctanthoma, thyroid follicular cancer and Kaposi's sarcoma.
    
    


Compounds of formula I may induce or inhibit apoptosis. The apoptotic response is aberrant in a variety of human diseases. Compounds of formula I, as modulators of apoptosis, will be useful in the treatment of cancer (including but not limited to those types mentioned hereinabove), viral infections (including but not limited to herpevirus, poxvirus, Epstein-Barr virus, Sindbis virus and adenovirus), prevention of AIDS development in HIV-infected individuals, autoimmune diseases (including but not limited to systemic lupus, erythematosus, autoimmune mediated glomerulonephritis, rheumatoid arthritis, psoriasis, inflammatory bowel disease, and autoimmune diabetes mellitus), neurodegenerative disorders (including but not limited to Alzheimer's disease, AIDS-related dementia, Parkinson's disease, amyotrophic lateral sclerosis, retinitis pigmentosa, spinal muscular atrophy and cerebellar degeneration), myelodysplastic syndromes, aplastic anemia, ischemic injury associated with myocardial infarctions, stroke and reperfusion injury, arrhythmia, atherosclerosis, toxin-induced or alcohol related liver diseases, hematological diseases (including but not limited to chronic anemia and aplastic anemia), degenerative diseases of the musculoskeletal system (including but not limited to osteoporosis and arthritis) aspirin-sensitive rhinosinusitis, cystic fibrosis, multiple sclerosis, kidney diseases and cancer pain.
The compounds of formula I are especially useful in treatment of tumors having a high incidence of IKK kinase activity, such as melanomas, and multiple myeloma. By the administration of a composition (or a combination) of the compounds of this invention, development of tumors in a mammalian host is reduced.
The invention also provides a pharmaceutical composition comprising a compound of formula I in combination with pharmaceutically acceptable carrier and an anti-cancer or cytotoxic agent. In one embodiment said anti-cancer or cytotoxic agent is selected from the group consisting of linomide; inhibitors of integrin αvβ3 function; angiostatin; razoxin; tamoxifen; toremifen; raloxifene; droloxifene; iodoxyfene; megestrol acetate; anastrozole; letrazole; borazole; exemestane; flutamide; nilutamide; bicalutamide; cyproterone acetate; gosereline acetate; luprolide; finasteride; metalloproteinase inhibitors; inhibitors of urokinase plasminogen activator receptor function; growth factor antibodies; growth factor receptor antibodies such as Avastin® and Erbitux®; tyrosine kinase inhibitors; serine/threonine kinase inhibitors); methotrexate; 5-fluorouracil; purine; adenosine analogues; cytosine arabinoside; doxorubicin; daunomycin; epirubicin; idarubicin; mitomycin-C; dactinomycin; mithramycin); cisplatin; carboplatin; nitrogen mustard; melphalan; chlorambucil; busulphan; cyclophosphamide; ifosfamide nitrosoureas; thiotephan; vincristine; Taxol®; Taxotere®; epothilone analogs; discodermolide analogs; eleutherobin analogs; etoposide; teniposide; amsacrine; topotecan; and flavopyridols.
In the field of medical oncology it is normal practice to use a combination of different forms of treatment to treat each patient with cancer. In medical oncology the other component(s) of such conjoint treatment in addition to the antiproliferative, antiangiogenic and/or vascular permeability reducing treatment defined herein before may be: surgery, radiotherapy or chemotherapy. Such chemotherapy may cover three main categories of therapeutic agent:
1: antiangiogenic agents such as inhibitors of VEGF or related kinases (such as FLT, or KDR), linomide, antibodies which block angiogenesis, inhibitors of integrin αvβ3 function, angiostatin, razoxin;
2: cytostatic agents such as antiestrogens (for example tamoxifen, toremifen, raloxifene, droloxifene, iodoxyfene), progestogens (for example megestrol acetate), aromatase inhibitors (for example anastrozole, letrazole, borazole, exemestane), antiharmones, antiprogestogens, antiandrogens (for example flutamide, nilutamide, bicalutamide, cyproterone acetate), LHRH agonists and antagonists (for example gosereline acetate, luprolide), inhibitors of testosterone 5α-dihydroreductase (for example finasteride), farnesyltransferase inhibitors, anti-invasion agents (for example metalloproteinase inhibitors like marimastat and inhibitors of urokinase plasminogen activator receptor function) and inhibitors of growth factor function, (such growth factors include for example EGF, FGF, platelet derived growth factor and hepatocyte growth factor such inhibitors include growth factor antibodies, growth factor receptor antibodies such as Avastin® and Erbitux®, tyrosine kinase inhibitors and serine/threonine kinase inhibitors);
3: antiproliferative/antineoplastic drugs and combinations thereof, as used in medical oncology, such as antimetabolites (for example antifolates like methotrexate, fluoropyrimidines like 5-fluorouracil, purine and adenosine analogues, cytosine arabinoside); Intercalating antitumour antibiotics (for example anthracyclines like doxorubicin, daunomycin, epirubicin and idarubicin, mitomycin-C, dactinomycin, mithramycin); platinum derivatives (for example cisplatin, carboplatin); alkylating agents (for example nitrogen mustard, melphalan, chlorambucil, busulphan, cyclophosphamide, ifosfamide nitrosoureas, thiotephan); antimitotic agents (for example vinca alkaloids like vincristine and taxoids like Taxol®, Taxotere® and newer microbtubule agents such as epothilone analogs, discodermolide analogs, and eleutherobin analogs); topoisomerase inhibitors (for example epipodophyllotoxins like etoposide and teniposide, amsacrine, topotecan); cell cycle inhibitors (for example flavopyridols).
The present invention thus provides methods for treating such conditions, comprising administering to a subject in need thereof an effective amount of at least one compound of formula I or a salt thereof. Other therapeutic agents such as those described below may be employed in combination with compounds of formula I. In the methods of the present invention, such other therapeutic agent(s) may be administered prior to, simultaneously with, or following administration of the inventive compound(s).
The present invention also provides pharmaceutical compositions capable of treating IKK, NF-κB and/or TNF-α associated conditions, as described above. The inventive compositions may contain other therapeutic agents and may be formulated, for example, by employing conventional solid or liquid vehicles or diluents, as well as pharmaceutical additives of a type appropriate to the mode of desired administration (for example, excipients, binders, preservatives, stabilizers, flavors, etc.) according to techniques such as those well known in the art of pharmaceutical formulation.
The compounds of formula I may be administered by any means suitable for the condition to be treated, which may depend on the need for site-specific treatment or quantity of drug to be delivered. Topical administration is generally preferred for skin-related diseases, and systematic treatment preferred for cancerous or pre-cancerous conditions, although other modes of delivery are contemplated. For example, the compounds may be delivered orally, such as in the form of tablets, capsules, granules, powders, or liquid formulations including syrups; topically, such as in the form of solutions, suspensions, gels or ointments; sublingually; bucally; parenterally, such as by subcutaneous, intravenous, intramuscular or intrasternal injection or infusion techniques (e.g., as sterile injectable aqueous or non-aqueous solutions or suspensions); nasally such as by inhalation spray; topically, such as in the form of a cream or ointment; rectally such as in the form of suppositories; or liposomally. Dosage unit formulations containing non-toxic, pharmaceutically acceptable vehicles or diluents may be administered. The compounds may be administered in a form suitable for immediate release or extended release. Immediate release or extended release may be achieved with suitable pharmaceutical compositions or, particularly in the case of extended release, with devices such as subcutaneous implants or osmotic pumps.
Exemplary compositions for topical administration include a topical carrier such as PLASTIBASE® (mineral oil gelled with polyethylene).
Exemplary compositions for oral administration include suspensions which may contain, for example, microcrystalline cellulose for imparting bulk, alginic acid or sodium alginate as a suspending agent, methylcellulose as a viscosity enhancer, and sweeteners or flavoring agents such as those known in the art; and immediate release tablets which may contain, for example, microcrystalline cellulose, dicalcium phosphate, starch, magnesium stearate and/or lactose and/or other excipients, binders, extenders, disintegrants, diluents and lubricants such as those known in the art. The inventive compounds may also be orally delivered by sublingual and/or buccal administration, e.g., with molded, compressed, or freeze-dried tablets. Exemplary compositions may include fast-dissolving diluents such as mannitol, lactose, sucrose, and/or cyclodextrins. Also included in such formulations may be high molecular weight excipients such as celluloses (AVICEL®) or polyethylene glycols (PEG); an excipient to aid mucosal adhesion such as hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC), sodium carboxymethyl cellulose (SCMC), and/or maleic anhydride copolymer (e.g., GANTREZ®); and agents to control release such as polyacrylic copolymer (e.g., CARBOPOL 934®). Lubricants, glidants, flavors, coloring agents and stabilizers may also be added for ease of fabrication and use.
Exemplary compositions for nasal aerosol or inhalation administration include solutions which may contain, for example, benzyl alcohol or other suitable preservatives, absorption promoters to enhance absorption and/or bioavailability, and/or other solubilizing or dispersing agents such as those known in the art.
Exemplary compositions for parenteral administration include injectable solutions or suspensions which may contain, for example, suitable non-toxic, parenterally acceptable diluents or solvents, such as mannitol, 1,3-butanediol, water, Ringer's solution, an isotonic sodium chloride solution, or other suitable dispersing or wetting and suspending agents, including synthetic mono- or diglycerides, and fatty acids, including oleic acid.
Exemplary compositions for rectal administration include suppositories which may contain, for example, suitable non-irritating excipients, such as cocoa butter, synthetic glyceride esters or polyethylene glycols, which are solid at ordinary temperatures but liquefy and/or dissolve in the rectal cavity to release the drug.
The effective amount of a compound of the present invention may be determined by one of ordinary skill in the art, and includes exemplary dosage amounts for a mammal of from about 0.05 to 100 mg/kg of body weight of active compound per day, which may be administered in a single dose or in the form of individual divided doses, such as from 1 to 4 times per day. It will be understood that the specific dose level and frequency of dosage for any particular subject may be varied and will depend upon a variety of factors, including the activity of the specific compound employed, the metabolic stability and length of action of that compound, the species, age, body weight, general health, sex and diet of the subject, the mode and time of administration, rate of excretion, drug combination, and severity of the particular condition. Preferred subjects for treatment include animals, most preferably mammalian species such as humans, and domestic animals such as dogs, cats, horses, and the like, subject to IKK, NF-κB and/or TNF-α associated conditions.
The inventive compounds and compositions may be employed alone or in combination with each other and/or other suitable therapeutic agents useful in treating IKK, NF-κB and/or TNF-α associated conditions. Exemplary of such other therapeutic agents include corticosteroids, rolipram, calphostin, CSAIDs, 4-substituted imidazo[1,2-A]quinoxalines as disclosed in U.S. Pat. No. 4,200,750; Interleukin-10, glucocorticoids, salicylates, nitric oxide, and other immunosuppressants; nuclear translocation inhibitors, such as deoxyspergualin (DSG); non-steroidal antiinflammatory drugs (NSAIDs) such as ibuprofen, celecoxib and rofecoxib; steroids such as prednisone or dexamethasone; antiviral agents such as abacavir; antiproliferative agents such as methotrexate, leflunomide, FK506 (tacrolimus, Prograf); cytotoxic drugs such as azathiprine and cyclophosphamide; TNF-α inhibitors such as tenidap, anti-TNF antibodies or soluble TNF receptor, and rapamycin (sirolimus or Rapamune) or derivatives thereof; and other cancer drugs and treatments, including radiation treatments and daunorubicin.
The above other therapeutic agents, when employed in combination with the compounds of the present invention, may be used, for example, in those amounts indicated in the Physicians' Desk Reference (PDR) or as otherwise determined by one of ordinary skill in the art.
The inventive compounds have been tested and have shown activity as inhibitors of IKK, IkB, NF-κB and/or TNF-α. For example, THP-1 (human monocytic cell line) obtained from ATCC was cultured in RPMI-1640 supplemented with 10% FBS, sodium pyruvate, HEPES, 5-mercaptoethanol, Penicillin/Streptomycin. To a 96-well plate containing THP-1 cells (1.4×106/mL, 2.5×105 cells/well) in 180 μL RPMI-1640 was added 10 μL of the test compound in 10% DMSO. Typically, test compound concentrations of 0.1-100 μM were used in the assay. After one hour at 37° C., 10 μL of 1000 ng/mL lipopolysaccharide (LPS from Salmonella typhosa, Sigma) was added to each well. After an additional 6 hours at 37° C., the supernatants were collected following a 5 minute centrifugation of the plate to pellet the cells. The amount of TNFα in these supernatants was then measured using a TNFα-specific ELISA (Pharmingen). After subtracting out the amount of TNFα in a control that had not been treated with LPS, the percent inhibition was calculated versus a control that was treated with LPS but with no test compound added. The compounds of this invention are active in vivo in the LPS-induced TNFα secretion model. Likewise, assays known in the field are applied to establish the activity of the compounds as inhibitors of IKK, IkB, and/or the NF-κB pathway.
EXPERIMENTALS
Abbreviations
For ease of reference, the following abbreviations are employed herein, including in the methods of preparation hereinbefore and in the Examples that follow:

    Ph=phenyl
    Bz=benzyl
    t-Bu=tertiary butyl
    Me=methyl
    Et=ethyl
    Pr=propyl
    Iso-P=isopropyl
    MeOH=methanol
    EtOH=ethanol
    EtOAc=ethyl acetate
    Boc=tert-butyloxycarbonyl
    CBZ=carbobenzyloxy or carbobenzoxy or benzyloxycarbonyl
    DMF=dimethyl formamide
    DMSO=dimethyl sulfoxide
    TEA=triethylamine
    TFA=trifluoroacetic acid
    THF=tetrahydrofuran
    KOH=potassium hydroxide
    K2CO3=potassium carbonate
    POCl3=phosphorous oxychloride
    KOtBu=potassium t-butoxide
    HOBt=1-hydroxybenzotriazole hydrate
    NaH=sodium hydride
    NaOH=sodium hydroxide
    Na2S2O3=sodium thiosulfate
    Pd=palladium
    min.=minute(s)
    L=liter
    mL=milliliter
    μL=microliter
    g=gram(s)
    mg=milligram(s)
    mol=moles
    mmol=millimole(s)
    meq=milliequivalent
    RT=room temperature
    ret. t.=HPLC retention time (minutes)
    ret. Time=HPLC retention time (minutes)
    sat or sat'd=saturated
    aq.=aqueous
    TLC=thin layer chromatography
    HPLC=high performance liquid chromatography
    LC/MS=high performance liquid chromatography/mass spectrometry
    MS=mass spectrometry
    NMR=nuclear magnetic resonance
    mp=melting point


The following Examples illustrate embodiments of the invention and are not intended to limit the scope of the claims. In the following Examples, anhydrous reactions were performed under an atmosphere of nitrogen or argon using either commercially available dry solvents or freshly distilled solvents. Reactions which refer to heating by microwave irradiation were performed on a Smith SynthesizerTM capable of generating reaction temperatures between 60 and 250° C., and pressures of 0-290 pounds per square inch (PSI). Column chromatography was performed using EM Science silica gel 60 with the designated solvent system as eluant. HPLC purification was conducted using a Shimadzu LC8A with YMC S5 ODS or xTerra MS C18 columns. HPLC purity determinations were done using either an HP 1090 DR5 with a diode array detector and a Waters Nova-Pak C18 column, or a Shimadzu LC-10AS with a SPD-10AV UV-V detector and Waters xTerra C18 column. Melting points were determined in an open capillary tube with a Thomas-Hoover melting point apparatus.
1H-NMR spectra were recorded in DMSO (δ=2.50 ppm) using a 500 MHZ instrument (unless otherwise stated) and chemical shifts are expressed in parts per million (ppm or δ) with the solvent in use as an internal standard. Coupling constants are given in Hertz, and multiplets are designated as follows: singlet (s), doublet (d), triplet (t), quartet (q), multiplet (m), broad (br), and apparent (app).
Low resolution mass spectra were determined with a Finnigan Matt TSQ-7000 or SSQ-700, or with a Shimadzu LC-10AS coupled with Waters Micromass ZQ. HRMS were determined with a Finnigan Matt 900.
PREPARATION OF INTERMEDIATES
Ethyl 2-methylthio-4-imidazole carboxylate, III




To a mixture of ethyl 2-mercapto-4-imidazole carboxylate (II) (49.82 g, 289 mmol) and K2CO3 (79.92 g, 579 mmol) in DMF (1500 mL) was added MeI (18.55 mL, 298 mmol) at room temperature, with stirring. After 18 hrs, it was filtered. The filtrate was concentrated under high vacuum to remove DMF. The residue was then filtered through a silica gel pad with EtOAc, and concentrated. PhMe (200 mL) was then added, followed by addition of Hexanes (1000 mL), precipitating III (50.5 g, 94%) as a yellow solid. 1H NMR (CDCl3, 400 MHz): 7.69 (s, 1H), 4.35 (q, J=7.1 Hz, 2H), 2.67 (s, 3H), 1.35 (t, J=7.1 Hz, 3H).
Methyl 1-methyl-2-methylthio-4-imidazolecarboxylate, V




To a solution of III (50.5 g, 266 mmol) in THF (anhydrous, 1000 mL) was added NaH (60%, 14.3 g) at −78° C. After 1 h, MeI (18.5 mL, 297 mmol) was added. The mixture was then gradually warmed to 0° C. Upon completion of the reaction, filtration followed by concentration provided a residue, which was then dissolved in EtOAc/CHCl3 (1500 mL, 2:1) and filtered to remove the solid. The filtrate was concentrated to give ethyl 1-methyl-2-methylthio-4-imidazolecarboxylate, IV, which was dissolved in MeOH (1000 mL) and stirred in the presence of K2CO3 (10 g). After 3 days, it was filtered and the MeOH was removed under vacuum. The residue was passed through a silica gel pad with EtOAc, furnishing compound V (methyl 1-methyl-2-methylthio-4-imidazole-carboxylate) (35.2 g, 67%) as a solid. 1H NMR (CDCl3, 400 MHz): 7.48 (s, 1H), 3.74 (s, 3H), 3.50 (s, 3H), 2.54 (s, 3H); ESI m/z=187.05 [(M+H)+; calcd for C7H11N2O2S: 187.05]
Alternatively, compound V can be prepared according to the following procedure:




2-[[Bis(methylthio)methylene]amino]-3-(dimethylamino)-2-propenoic acid, methyl ester, XIX




Commercially available N-[Bis(methylthio)methylene]glycine methyl ester (5.06 g, 26.18 mmol) and N,N-Dimethylformamide dimethyl acetal (4.03 g, 31.41 mmol) were dissolved in N,N-dimethylformamide (10 mL) and heated to reflux under nitrogen for 4.5 h. The solvent was removed under reduced pressure and the product solidified (6.44 g, 99%) after storage at room temperature under high vacuum over night. 1H NMR (CDCl3, 400 MHz): δ 6.96 (s, 1H); 3.68 (s, 3H); 2.95 (s, 6H); 2.53 (s, 3H); 2.49 (s, 3H).
Methyl 1-methyl-2-methylthio-4-imidazolecarboxylate, V
XIX (8.29 g, 33.39 mmol) and methylamine hydrochloride (2.71 g, 40.07 mmol) were added to methanol (150 mL) and heated at reflux for 32 h. The reaction mixture was cooled and concentrated with silica gel ( ̃20 g). The mixture was placed on top of a silica gel column and the product eluted with 90% ethyl acetate 10% heptane. Concentration of the appropriate fractions provided 4.13 g (66%) of the title product as a yellow solid. LCMS (10% MeOH, 90% H20, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 2 minute gradient with a Phenomenex S5 column 4.6×30 mm produced a retention time of 0.56 minutes, and a [M+H]+ m/z=187.16.
Methyl 1-methyl-2-methylthio-5-chloro-4-imidazolecarboxylate, VI




A mixture of V (35.2 g, 189 mmol) and NCS (26.5 g, 198 mmol) was stirred in CH2Cl2 (1000 mL) at room temperature. After 18 hrs, concentration followed by extractive workup with EtOAc/H2O and filtration through a silica gel pad with EtOAc/Hex (50:50) provided compound VI (methyl 1-methyl-2-methylthio-5-chloro-4-imidazolecarboxylate) (39.8 g, 95%) as a solid. 1H NMR (CDCl3, 400 MHz): 3.94 (s, 3H), 3.57 (s, 3H), 2.70 (s, 3H); ESI m/z=243.67 [(M+Na)+; calcd for C7H9ClN2O2S+Na: 243.00]
Methyl 1-methyl-2-methanesulfonyl-5-chloro-4-imidazolecarboxylate, VII




A mixture of VI (39.8 g, 180 mmol) and MCPBA (93.4 g) in CH2Cl2 (1000 mL) was stirred at room temperature for 6 h. NEt3 (100 mL) was added to neutralize the acid, followed by addition of MgSO4 to remove H2O. It was then passed through a silica gel pad with EtOAc, furnishing compound VII (methyl 1-methyl-2-methanesulfonyl-5-chloro-4-imidazolecarboxylate) (38.1 g, 84%) as a white solid. 1H NMR (CDCl3, 400 MHz): 3.89 (s, 3H), 3.87 (s, 3H), 3.40 (s, 3H); ESI m/z=253.06 [(M+H)+; calcd for C7H9ClN2O4S+H: 253.00]
1-Methyl-2-methanesulfonyl-7-phenyl-4H-pyrazolo[5,1-b]purin-4-one, IX




A mixture of 5-amino-3-phenylpyrazole (1.4244 g, 5.58 mmol), VIII, and VII (1.0839 g, 4.29 mmol) was stirred vigorously at the presence of Cs2CO3 (5.591 g, 17.16 mmol) in DMF (anhydrous, 43 mL) at 100° C. After 30 h, it was filtered and the filtrate was concentrated under high vacuum to remove DMF. The residue was treated with pH 7 buffer solution (50 mL), then carefully neutralized with 1.0 N HCl. The precipitate was filtered and washed with H2O and EtOAc, providing IX (525.8 mg, 36%) as a white solid. 1H NMR (DMSO, 400 MHz): 12.3 (s, 1H), 7.97 (d, J=7.51 Hz, 2H), 7.49 (t, J=7.51 Hz, 2H), 7.42 (t, J=7.51 Hz, 1H), 6.46 (s, 1H), 3.55 (s, 3H); ESI m/z=344.03 [(M+H)+; calcd for C15H13N5O3S+H: 344.08]
1-Methyl-7-phenyl-4H-pyrazolo[5,1-b]purin-4-one, X




A solution of IX (525.8 mg, 1.53 mmol) in dioxane (anhydrous, 30 mL) was treated with LiBHEt3 (1.0 M/THF, 6.1 mL) at room temperature. After 3 h, it was carefully quenched with MeOH and concentrated. The residue was treated with pH 7 buffer solution (40 mL), then neutralized with 1.0 N HCl. The precipitate was filtered and washed with H2O, providing compound X (385.4 mg, 95%) as a white solid. 1H NMR (DMSO, 400 MHz): 12.03 (s, 1H), 7.95 (d, J=7.10 Hz, 2H), 7.92 (s, 1H), 7.47 (t, J=7.09 Hz, 2H), 7.40 (t, J=7.33 Hz, 1H), 6.38 (s, 1H), 4.20 (s, 3H); ESI m/z=266.08 [(M+H)+; calcd for C14H11N5O+H: 266.10]
1-Amino-5-tri-isopropylsilyloxypyrazole, XIII




To a mixture of XII (29.03 g, 293 mmol) and NEt3 (78 mL, 572 mmol) in DMF (500 mL) was added TIPSCl (53.8 g, 279 mmol) at 60° C. After 3 days, DMF was removed under high vacuum; the residue was worked up with EtOAc/H2O. Filtration through a silica gel pad with a gradient of EtOAc/Hex (30:70 to 100%) furnished compound XIII (42.7 g, 57%) as a semi-solid. 1H NMR (DMSO, 400 MHz): 10.27 (s, 1H), 4.85 (s, 1H), 4.64 (s, 1H), 1.21 (m, 3H), 1.05 (d, J=7.34 Hz, 18H); ESI m/z=256.25 [(M+H)+; calcd for C12H25N3OSi+H: 256.18]
1-Methyl-2-methanesulfonyl-7-tri-isopropylsilyloxy-4H-pyrazolo[5,1-b]purin-4-one, XIV




A mixture of XIII (27.67 g, 108 mmol) and VII (5.4739 g, 21.7 mmol) was stirred in the presence of Cs2CO3 (56.5 g, 173 mmol) in DMF (anhydrous, 400 mL) at 100° C. under N2. After 8 h, it was cooled, filtered, and concentrated under high vacuum to remove DMF. The residue was treated with pH 7 buffer solution (200 mL) and CHCl3 (1000 mL), then carefully neutralized with 1.0 N HCl under stirring. The CHCl3 layer was further washed with H2O (250 mL) and dried over MgSO4. Filtration and concentration provided an oily residue, which was immediately treated with hexanes (500 mL) precipitating a white solid composing a 1:1 mixture of XIII and XIV. Flash chromatography with EtOAc/CH2Cl2 (1:5) on silica gel gave compound XIV (4.7337 g, 50%) as a white solid. 1H NMR (DMSO, 400 MHz): 12.08 (s, 1H), 5.41 (s, 1H), 4.30 (s, 1H), 3.49 (s, 1H), 1.33 (m, 3H), 1.10 (d, J=7.58 Hz, 18H); ESI m/z=440.12 [(M+H)+; calcd for C18H29N5O4SSi+H: 440.18]
1-Methyl-7-tri-isopropylsilyloxy-4H-pyrazolo[5,1-b]purin-4-one, XV




A solution of XIV (8.3 g, 18.9 mmol) in anhydrous dioxane (200 mL) was treated with LiBHEt3 (1.0 M/THF, 76 mL) at room temperature. After 2 h, CH2Cl2 (400 mL) was added, followed by careful addition of pH 7 buffer solution (400 mL). The aqueous layer was then neutralized with 1.0 N HCl. The CH2Cl2 layer was dried over MgSO4, filtered and concentrated. The solid residue was then washed with hexanes, providing compound XV (6.689 g, 98%) as a white solid. 1H NMR (DMSO, 400 MHz): 11.75 (s, 1H), 7.79 (s, 1H), 5.32 (s, 1H), 4.00 (s, 3H), 1.32 (m, 3H), 1.10 (d, J=7.34 Hz, 18H); ESI m/z=362.21 [(M+H)+; calcd for C17H27N5O2Si+H: 362.20]
1-Methyl-7-hydroxy-4H-pyrazolo[5,1-b]purin-4-one, XVI




A solution of XV (5.87 g, 22.1 mmol) in THF/HOAc (16:1, 170 mL) was treated with n-Bu4NF (1.0 M/THF, 32.5 mL) and stirred at room temperature for 4 h. The white precipitate was filtered and washed with CH2Cl2, furnishing compound XVI (3.09 g, 92%) as a white solid. 1H NMR (DMSO, 400 MHz): 11.66 (s, 1H), 10.71 (s, 1H), 7.79 9s, 1H), 5.21 (s, 1H), 5.0 (br s, 1H), 4.20 (s, 3H); ESI m/z=206.04 [(M+H)+; calcd for C8H7N5O2+H: 206.07]
1-Methyl-4-methylamino-7-trifluoromethanesulfonyloxy-4H-pyrazolo[5,1-b]purin-4-one, XVII




Compound XVII was prepared from compound XVI according to the above scheme.
1-Methyl-4-cyclopropylamino-7-trifluoromethanesulfonyloxy-4H-pyrazolo[5,1-b]purin-4-one, XVIII




A mixture of 11 (2.3839 g, 11.6 mmol) and K2CO3 (6.43 g, 46.5 mmol) in DMF (100 mL) was treated with N-Phenyl trifluoromethanesulfonimide (12.4595 g, 34.9 mmol) at room temperature for 5 h. Cyclopropylamine (6.6 mL, 95.2 mmol) was then added, and the mixture was further stirred for another 2 h at room temperature. The solid was filtered out and the filtrate was concentrated under high vacuum to remove DMF. The residue was subsequently dissolved with EtOAc (200 mL), washed with H2O (5×100 mL), and dried over MgSO4. Flash chromatography (EtOAc/Hexanes, 70:30) provided compound 12 (3.028 g, 69%) as a white solid. 1H NMR (DMSO, 400 MHz): 8.09 (d, J=3.42 Hz, 1H), 8.02 (s, 1H), 6.29 (s, 1H), 4.09 (s, 3H), 2.96 (m, 1H); 0.73 (m, 2H), 0.65 (m, 2H); ESI m/z=377.00 [(M+H)+; calcd for C12H11F3N6O3S+H: 377.06]
EXAMPLE 1








A mixture of IX (13.2 mg, 0.0498 mmol) and K2CO3 (20.6 mg, 0.149 mmol) in DMF (1.0 mL) was treated with N-phenyl trifluoromethanesulfonimide (35.6 mg, 0.0997 mmol) at room temperature for 5 h. Cyclopropylamine (6.6 mL, 95.2 mmol) was then added, and the mixture was further stirred for another 2 h at room temperature. Extractive EtOAc/H2O workup followed by flash chromatography (EtOAc/Hexanes, 70:30) provided the title compound (9.1 mg, 60%) as a white solid. 1H NMR (d-MeOD, 400 MHz): 7.89 (d, J=7.51 Hz, 2H), 7.72 (s, 1H), 7.39 (t, J=7.51 Hz, 2H), 7.31 (t, J=7.51 Hz, 1H), 6.51 (s, 1H), 4.25 (s, 3H), 2.87 (m, 1H), 0.87 (m, 2H), 0.63 (m, 1H); ESI m/z=305.13 [(M+H)+; calcd for C17H16N6+H: 305.15]
By the same method, using commercially available amines, the following other R4 analogs were prepared:













Example





#
Structure
ESI m/z
1H NMR (Solvent, 400 MHz)


















2




279.07
d-MeOD: 7.92 (d, J=8.56Hz, 2H), 7.77 (s, 1H), 7.40(t, J=8.32 Hz, 2H), 7.32 (t, J=7.33 Hz, 1H), 6.49 (s, 1H),4.29 (s, 3H), 3.07 (s, 3H)


 


3





d-CDCl3: 7.92 (d, J=7.09Hz, 2H), 7.45 (s, 1H), 7.41 (t,J=7.58 Hz, 2H), 7.32 (t, J=7.34 Hz, 1H), 6.51 (s, 1H),6.33 (br s, 1H), 4.29 (s, 3H),3.71 (m, 2H), 2.65 (t, J=6.12Hz, 2H), 2.47 (m, 4H), 1.62(m, 4H), 1.45 (m, 2H)


 


4





d-DMSO: 7.97 (s, 1H), 7.96(d, J=6.61 Hz, 2H), 7.45 (t, J=7.34 Hz, 2H), 7.38-7.34 (m,2H), 6.60 (s, 1H), 4.81 (t, J=5.38 Hz, 1H), 4.26 (s, 3H),3.61 (t, J=5.62 Hz, 2H), 3.56(t, J=5.62 Hz, 2H)


 


5




323.17
d-DMSO: 7.97-7.95 (m, 3H),7.53 (t, J=5.38 Hz, 1H), 7.45(t, J=7.34 Hz, 2H), 7.36 (tt, J=7.34, 1.22 Hz, 1H), 6.60 (s,1H), 7.59 (t, J=5.14 Hz,1H), 4.25 (s, 3H), 3.56-3.49(m, 4H), 1.78 (quintet, J=6.60 Hz, 2H)


 


6





d-MeOD: 7.94 (d, J=7.09Hz, 2H), 7.85 (s, 1H), 7.41 (t,J=7.33 Hz, 2H), 7.34 (t, J=7.33 Hz, 1H), 6.56 (s, 1H),4.33 (s, 3H), 3.88-3.84 (m,2H), 3.28-3.23 (m, 2H)


 


7




366.09
d-MeOD: 7.93 (d, J=7.09Hz, 2H), 7.75 (s, 1H), 7.40 (t,J=7.33 Hz, 2H), 7.32 (t, J=7.58 Hz, 1H), 6.53 (s, 1H),4.27 (s, 3H), 3.73 (t, J=5.87Hz, 2H), 3.32 (s, 2H), 3.03 (t,J=5.87 Hz, 2H)


 


8




349.21
d-MeOD: 7.89-7.86 (m, 3H),7.44-7.34 (m, 3H), 6.60 (s,1H), 4.25 (s, 3H), 4.10 (m,1H), 3.60 (br s, 1H), 3.54 (brs, 1H), 1.29 (d, J=6.12 Hz,3H)


 


9




311.14



 


10




350.12
d-MeOD: 7.89 (d, J=8.31Hz, 2H), 7.84 (s, 1H), 7.43-7.34 (m, 3H), 6.61 (s, 1H),4.24 (s, 3H), 3.68 (br s, 2H),3.50 (t, J=6.11 Hz, 2H), 1.97(s, 3H)


 


11




319.12
d-MeOD: 7.91 (d, J=7.10Hz, 2H), 7.90 (s, 1H), 7.43 (t,J=7.09 Hz, 2H), 7.37 (t, J=7.09 Hz, 1H), 6.62 (s, 1H),4.30 (s, 3H), 3.46 (br s, 2H),1.24 (m, 1H), 0.66-0.62 (m,2H), 0.40-0.36 (m, 2H)


 


12




350.16
d-MeOD: 7.94 (d, J=7.09Hz, 2H), 7.85 (s, 1H), 7.42 (t,J=7.09 Hz, 2H), 7.34 (t, J=7.34 Hz, 1H), 6.57 (s, 1H),4.33 (s, 3H), 4.10 (br s, 2H),3.69 (t, J=6.60 Hz, 2H), 3.26(s, 9H)


 


13




356.12
d-MeOD: 8.65 (d, J=5.62Hz, 1H), 8.30 (td, J=8.07,1.47 Hz, 1H), 7.91 (d, J=7.83 Hz, 2H), 7.88 (s, 1H),7.73 (t, J=6.60 Hz, 1H), 7.40(t, J=7.83 Hz, 2H), 7.32 (t, J=7.58 Hz, 1H), 6.47 (s, 1H),5.05 (s, 2H), 4.34 (s, 3H)


 


14




370.16
d-MeOD: 8.69 (d, J=6.11,1H), 8.38 (td, J=7.83, 1.71Hz, 1H), 7.96 (d, J=8.07 Hz,1H), 7.93 (d, J=7.10 Hz,2H), 7.82 (s, 1H), 7.78 (ddd, J=7.33, 5.87, 0.98 Hz, 1H),7.42 (t, J=7.58 Hz, 2H), 7.34(tt, J=7.58, 1.22 Hz, 1H),6.44 (s, 1H), 4.30 (s, 3H),4.06 (t, J=6.11 Hz, 2H), 3.42(t, J=6.36 Hz, 2H)









EXAMPLE 15




1-Methyl-4-cyclopropylamino-7-(3′-acetamidomethyl-4′-fluorophenyl-pyrazolo[5,1-b]purine
A. 3-Aminomethyl-4-fluoro-1-trimethylstannylbenzene




A mixture of 5-bromo-2-fluorobenzylamine (15.568 g, 76.3 mmol) and hexamethylditin (30 g, 91.6 mmol) was heated at 100° C. at the presence of Pd(PPh3)4 (3.0 g, 2.60 mmol) in toluene (400 mL). After 3 h, filtration through a silica gel plug with EtOAc provided a white solid. Further wash with saturated Na2CO3 furnished compound 16 (17.02 g, 77.5%) an oil. 1H NMR (CDCl3, 400 MHz): 7.39 (d, J=8.34 Hz, 1H), 7.33 (t, J=5.83 Hz, 1H), 7.02 (dd, J=10.83, 7.91 Hz, 1H), 3.89 (s, 2H), 1.41 (s, 2H), 0.28 (s, 9H).
B. 1-Methyl-4-cyclopropylamino-7-(3′-acetamidomethyl-4′-fluorophenyl-pyrazolo[5,1-b]purine




A mixture of XVIII (514.8 mg, 1.37 mmol), 3-aminomethyl-4-fluoro-1-trimethylstannylbenzene (787.8 mg, 2.74 mmol), Pd(PPh3)4 (158.1 mg, 0.137 mmol) and LiCl (410.4 mg, 4.10 mmol) was heated at 100° C. in dioxane (14 mL). After 7 h, it was cooled down and EtOAc was added (30 mL). The precipitate was filtered and sequentially washed with saturated Na2CO3, H2O and EtOAc. Further purification by flash chromatography (MeOH/CH2Cl2, 5%) furnished compound the title compound (191.8 mg, %) as a white solid. 1H NMR (d-DMSO, 400 MHz): 8.08 (dd, J=7.58, 2.20 Hz, 1H), 7.96 (s, 1H), 7.84 (ddd, J=7.83, 5.14, 2.20 Hz, 1H), 7.73 (d, J=4.16 Hz, 1H), 7.21 (dd, J=10.03, 8.56 Hz, 1H), 6.62 (s, 1H), 3.81 (3, 2H), 2.98 (m, 1H), 0.73 (m, 2H), 0.65 (m, 2H); ESI m/z=352.16 [(M+H)+; calcd for C18H18FN7+H: 352.17]
EXAMPLE 16




1-Methyl-4-cyclopropylamino-7-(3′-acetamidomethyl-4′-fluorophenyl)-pyrazolo[5,1-b]purine
A. 3-Acetamidomethyl-4-fluoro-1-trimethylstannylbenzene




A mixture of 3-aminomethyl-4-fluoro-1-trimethylstannylbenzene (505.4 mg, 1.76 mmol), Ac2O (215.3 μL, 2.28 mmol) and NEt3 (489 μL, 3.51 mmol) was stirred at room temperature in CH2Cl2 (18 mL). After 3 h, extractive EtOAc/H2O workup followed by flash chromatography (EtOAc/Hexanes, 40:60) provided the title compound (422 mg, 73%) as an oil. 1H NMR (DMSO, 400 MHz): 8.29 (br s, 1H), 7.41 (d, J=7.52 Hz, 1H), 7.45-7.30 (m, 1H), 7.14 (dd, J=10.9, 8.2 Hz, 1H), 4.27 (d, J=5.47 Hz, 2H), 1.85 (s, 3H), 0.26 (s, 9H).
B. 1-Methyl-4-cyclopropylamino-7-(3′-acetamidomethyl-4′-fluorophenyl)-pyrazolo[5,1-b]purine




A mixture of XVIII (375.7 mg, 0.998 mmol), 3-acetamidomethyl-4-fluoro-1-trimethylstannylbenzene (575 mg, 1.75 mmol), Pd(PPh3)4 (115 mg, 0.0995 mmol) and LiCl (299.5 mg, 3.00 mmol) was heated at 100° C. in Dioxane (10 mL). After heating overnight, it was cooled down and EtOAc (30 mL) was added. The precipitate was filtered and sequentially washed with saturated Na2CO3, H2O and EtOAc. Further purification by flash chromatography (MeOH/CH2Cl2, 5%) furnished compound tht title compound (170 mg, 43%) as a white solid. 1H NMR (d-DMSO, 400 MHz): 8.39 (t, J=5.87 Hz, 1H), 7.96 (s, 1H), 7.91 (d, J=6.14 Hz, 1H), 7.87 (m, 1H), 7.73 (J=4.10 Hz, 1H), 7.26 (t, J=8.88 Hz, 1H), 6.60 (s, 1H), 4.35 (d, J=5.46 Hz, 2H), 4.26 (s, 3H), 2.97 (m, 1H), 1.90 (s, 3H), 0.72 (m, 2H), 0.65 (m, 2H); ESI m/z=394.25 [(M+H)+; calcd for C20H20FN7O+H: 394.18]
EXAMPLE 17




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-methanesulfonamidomethyl-phenyl)-pyrazolo[5,1-b]purine
A. 3-Methanesulfonamidomethyl-4-fluoro-1-trimethylstannylbenzene




A mixture of 3-aminomethyl-4-fluoro-1-trimethylstannylbenzene (507.9 mg, 1.76 mmol), ClSO2Me (180.9 μL, 2.29 mmol) and NEt3 (492 μL, 3.52 mmol) was stirred at room temperature in CH2Cl2 (18 mL). After 3 h, extractive EtOAc/H2O workup followed by flash chromatography (EtOAc/Hexanes, 20:80) provided the title compound (342 mg, 53%) as an oil. 1H NMR (CDCl3, 400 MHz.
B. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-methanesulfonamidomethyl-phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B from compound XVII and 3-methanesulfonamidomethyl-4-fluoro-1-trimethylstannylbenzene. ESI m/z=430.20 [(M+H)+; calcd for C19H20FN7O2S+H: 430.15] 1H NMR d-DMSO: 8.07 (dd, J=7.33, 2.44 Hz, 1H), 7.97 (s, 1H), 7.91 (ddd, J=7.82, 4.40, 1.95 Hz, 1H), 7.74 (d, J=3.91 Hz, 1H), 7.64 (t, J=6.11 Hz, 1H), 7.30 (dd, J=10.07, 8.56 Hz, 1H), 6.61 (s, 1H), 4.28 (d, J=6.12 Hz, 1H), 4.26 (s, 3H), 2.99 (m, 1H), 2.94 (s, 3H), 0.73 (m, 2H), 0.65 (m, 2H).
EXAMPLE 18




1-Methyl-4-cyclopropylamino-7-(3′methylsulfoxyl-phenyl)-pyrazolo[5,1-b]purine
A. 3-Bromophenyl methyl sulfoxide




A mixture of 3-bromothioanisole (4.9687 g, 0.0245 mmol) and MCPBA (5.066 g, %) was stirred at room temperature. After 4 h, extractive EtOAc/H2O workup followed by flash chromatography (EtOAc/Hexanes, 50:50) provided the title compound (3.725 g, 69%) as an oil. 1H NMR (DMSO, 400 MHz): 7.80 (br s, 1H), 7.61 (d, J=8.01 Hz, 1H), 7.53 (d, J=8.01 Hz, 1H), 7.39 (t, J=8.01 Hz, 1H), 2.72 (s, 3H).
B. 3-Trimethylstannylphenyl methyl sulfoxide




A mixture of compound 3-Bromophenyl methyl sulfoxide (3.7247 g, 17 mmol) and hexamethylditin (7.239 g, 22 mmol) was heated at 100° C. at the presence of Pd(PPh3)4 (982 mg, 0.85 mmol) in toluene (80 mL). After 3 h, flash chromatography (EtOAc/Hexanes, 50:50) provided the title compound (4.875 g, 94% yield) as an oil. 1H NMR (CDCl3, 400 MHz): 7.75 (s, 1H), 7.61 (d, J=7.09 Hz, 1H), 7.54 (d, J=7.82 Hz, 1H), 7.46 (t, J=7.10 Hz, 1H), 2.72 (s, 3H), 0.32 (s, 9H).
C. 1-Methyl-4-cyclopropylamino-7-(3′methylsulfoxyl-phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B from compound XVII and 3-trimethylstannylphenyl methyl sulfoxide. ESI m/z=367.22 [(M+H)+; calcd for C18H18N6OS+H: 367.13] 1H NMR d-MeOD: 8.25 (s, 1H), 8.08-8.06 (m, 1H), 7.74 (s, 1H), 7.62-7.61 (m, 2H), 6.59 (s, 1H), 4.28 (s, 3H), 2.91-2.86 (m, 1H), 2.85 (s, 3H), 0.89-0.85 (m, 2H), 0.66-0.62 (m, 2H).
EXAMPLE 19




1-Methyl-4-cyclopropylamino-7-(3′-aminomethyl-phenyl)-pyrazolo[5,1-b]purine
A. (3-Aminomethylphenyl)trimethyl stannane




The title compound was prepared by the method of example 15, part A, from 3-bromo-benzylamine and hexamethyl-di-tin. 1H NMR (d-DMSO, 400 MHz): 7.43 (s, 1H), 7.32-7.26 (m, 3H), 3.72 (s, 2H), 1.71 (br s, 2H), 0.27 (s, 9H).
B. 1-Methyl-4-cyclopropylamino-7-(3′-aminomethyl-phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B from compound XVII and (3-aminomethylphenyl)trimethyl stannane. ESI m/z=334.23 [(M+H)+; calcd for C18H19N7+H: 334.18]. 1H NMR d-DMSO: 7.96-7.92 (m, 2H), 7.84-7.70 (m, 2H), 7.38 (t, J=7.58 Hz, 1H), 7.33 (s, 1H), 6.62 (s, 1H), 4.26 (s, 3H), 3.78 (s, 2H), 2.98 (m, 1H), 0.72 (m, 2H), 0.65 (m, 2H)
EXAMPLE 20




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(2′′-methanesulfonamidoethyl)-phenyl)-pyrazolo[51-b]purine
A. 3(2′-Aminoethyl)-4-fluorophenyl trimethylstannane




A mixture of 2(5′-bromo-2-fluorophenyl)ethylamine (376.0 mg, 1.72 mmol), Me3SnSnMe3 (847 mg, 2.59 mmol) and Pd(PPh3)4 (99.6 mg, 0.0862 mmol) in toluene (17 mL) was heated at 100° C. After 3 h, concentration and flash chromatography (EtOAc) followed by wash with sat. Na2CO3 provided the title compound (351 mg, 67%) as an oil. 1H NMR (CDCl3, 400 MHz): 7.34-7.25 (m, 2H), 6.95 (dd, J=11.02, 8.48 Hz, 1H), 6.92 (br s, 2H), 3.23 (m, 2H), 3.11 (m, 2H), 0.25 (s, 9H).
B. 3(2′-Methanesulfonamidoethyl)-4-fluorophenyl trimethylstannane




A mixture of 3(2′-aminoethyl)-4-fluorophenyl trimethylstannane (184.9 mg, 0.612 mmol), ClSO2Me (62.8 μL, 0.796 mmol) and NEt3 (171 μL, 1.22 mmol) was stirred in CH2Cl2 (6.0 mL) at room temperature. After 6 h, extractive workup with EtOAc/sat. Na2CO3 and flash chromatography (EtOAc/Hexanes, 20:80) provided the title compound (111.6 mg, %) as an oil.
C. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(2′′-methanesulfonamidoethyl)-phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B from compound XVII and 3(2′-methanesulfonamidoethyl)-4-fluorophenyl trimethylstannane. ESI m/z=444.09 [(M+H)+; calcd for C20H22FN7O2S+H: 444.16]. 1H NMR d-MeOD: 7.91 (dd, J=7.09, 1.95 Hz, 1H), 7.86-7.82 (m, 1H), 7.80 (s, 1H), 7.13 (dd, J=9.79, 8.56 Hz, 1H), 6.55 (s, 1H), 4.32 (s, 3H), 3.36 (t, J=7.10 Hz, 2H), 2.96 (t, J=7.82 Hz, 2H), 2.92-2.89 (m, 1H), 2.85 (s, 3H), 0.91-0.86 (m, 2H), 0.67-0.63 (m, 2H)
EXAMPLE 21




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(2′′-acetamidoethyl)-phenyl)-pyrazolo[5,1-b]purine
A. 3(2′-Acetamidoethyl)-4-fluorophenyl trimethylstannane




A mixture of 3(2′-aminoethyl)-4-fluorophenyl trimethylstannane (164.9 mg, 0.546 mmol), Ac2O (67 μL, 0.710 mmol) and NEt3 (152 μL, 1.09 mmol) was stirred in CH2Cl2 (6.0 mL) at room temperature. After 6 h, extractive workup with EtOAc/sat. Na2CO3 and flash chromatography (EtOAc/Hexanes, 20:80) provided the title compound (85.6 mg, %) as an oil.
B. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(2′′-acetamidoethyl)-phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and 3(2′-acetamidoethyl)-4-fluorophenyl trimethylstannane. ESI m/z=408.21 [(M+H)+; calcd for C21H22FN7O+H: 408.19]. 1NMR d-MeOD: 7.85-7.81 (m, 2H), 7.79 (s, 1H), 7.11 (t, J=9.78, 8.56 Hz, 1H), 6.53 (s, 1H), 4.31 (s, 3H), 3.44 (t, J=7.34 Hz, 2H), 2.93-2.88 (m, 2H), 1.90 (s, 3H), 0.90-0.86 (m, 2H), 0.66-0.63 (m, 2H)
EXAMPLE 22




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(1′′-acetamidoethyl)-phenyl)-pyrazolo[5,1-b]purine
A. 1(2′-Fluoro-5′-bromo)phenylethanol




To a solution of 5-bromo-2-fluorobenaldehyde (5.43 g, 26.7 mmol) in CH2Cl2 (200 mL) was added dropwise AlMe3 (2.0 M in PhMe, 16 mL) at −78° C. After 0.5 h, it was warmed to room temperature for another 0.5 h. The reaction was then quenched by slow addition of 1.0 N HCl. The organic layer was dried over MgSO4 and filtered. Flash chromatography (EtOAc/Hexanes, 50:50) furnished the title compound (5.33 g, 91%) as an oil. 1H NMR (CDCl3, 400 MHz): 7.63 (dd, J=6.60, 2.45 Hz, 1H), 7.33 (ddd, J=8.80, 4.65, 2.69 Hz, 1H), 6.90 (dd, J=9.78, 8.80 Hz, 1H), 5.15 (m, 1H), 1.92 (d, J=3.91 Hz, 1H), 1.49 (d, J=6.36 Hz, 3H).
B. N-(1(2′-fluoro-5-bromophenyl)ethyl)acetamide




A solution of 1(2′-fluoro-5′-bromo)phenylethanol (1.725 g, 7.87 mmol) and MeCN (823 μL, 15.7 mmol) in CH2Cl2 (40 mL) was treated with BF3.OEt2 (998 μL, 7.87 mmol) was room temperature, then heated at 65° C. for 20 h. Normal extractive workup with saturated Na2CO3/EtOAc followed by flash chromatography (EtOAc/Hexanes, 50:50) provided the title compound (952.7 mg, % yield) as an oil. 1H NMR (CDCl3, 400 MHz): 7.38 (dd, J=6.60, 2.45 Hz, 1H), 7.33 (ddd, J=8.56, 4.64, 2.44 Hz, 1H), 6.92 (dd, J=10.27, 8.56 Hz, 1H), 5.81 (br s, 1H), 5.21 (quintet, J=7.34 Hz, 1H), 1.99 (s, 3H), 1.46 (d, J=6.85 Hz, 3H).?
C. N-(1(2′-fluoro-5-trimethylstannylphenyl)ethyl)acetamide




A mixture of N-(1(2′-fluoro-5-bromophenyl)ethyl)acetamide (952.7 mg, 3.66 mmol) and hexamethylditin (1.56 g, 4.76 mmol) was heated at 100° C. at the presence of Pd(PPh3)4 (211.7 mg, 0.183 mmol) in toluene (37 mL). After 3 h, flash chromatography (hexanes to EtOAc/hexanes=1:1) provided a white solid. Further wash with saturated Na2CO3 furnished the title compound (1.057 g, 77.5% yield) as an oil. 1H NMR (CDCl3, 400 MHz): 7.41-7.28 (m, 1H), 7.34 (d, J=7.09 Hz, 1H), 7.02 (dd, J=11.24, 7.58 Hz, 1H), 5.97 (d, J=8.56 Hz, 1H), 5.24 (quintet, J=7.09 Hz, 1H), 1.58 (s, 3H), 1.49 (d, J=7.09 Hz, 3H), 0.27 (s, 9H).
D. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(1′′-acetamidoethyl)-phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and N-(1(2′-fluoro-5-trimethylstannylphenyl)ethyl)acetamide. ESI m/z=408.28 [(M+H)+; calcd for C21H22FN7O+H: 408.19]
EXAMPLE 23




1-Methyl-4-cyclopropylamino-7-(3′-methoxycarbonylmethylphenyl)-pyrazolo[5,1-b]purine
A. Methyl 3-trimethylstannylphenylacetate




The title compound is prepared by the method of Example 15, part A, from methyl (3′-bromophenyl)acetate and hexamethyl-di-tin. 1NMR d-CDCl3: 7.41-7.23 (m, 4H), 3.70 (s, 3H), 3.62 (s, 2H), 0.29 (s, 9H)
B. 1-Methyl-4-cyclopropylamino-7-(3′-methoxycarbonylmethylphenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and methyl 3-trimethylstannylphenylacetate. ESI m/z=377.12 [(M+H)+; calcd for C20H20N6O2+H: 377.17]. 1NMR d-CDCl3: 7.83 (s, 1H), 7.80 (d, J=7.58 Hz, 1H), 7.41 (s, 1H), 7.37 (t, J=7.58 Hz, 1H), 7.25 (d, J=6.84 Hz, 1H), 6.59 (s, 1H), 5.92 (s, 1H), 4.28 (s, 3H), 3.69 (apparent s, 5H), 3.00 (m, 1H), 0.90 (m, 2H), 0.65 (m, 2H)
EXAMPLE 24




1-Methyl-4-cyclopropylamino-7-(3′-carboxymethylphenyl)-pyrazolo[5,1-b]purine
Example 24 was prepared from 23B through a standard hydrolysis. ESI m/z=363.11 [(M+H)+; calcd for C19H18N6O2+H: 363.16]. 1NMR d-DMSO: 12.43 (s, 1H), 7.98 (s, 1H), 7.87 (s, 1H), 7.84 (d, J=8.07 Hz, 1H), 7.40 (t, J=7.58 HZ, 1H), 7.26 (d, J=7.83 Hz, 1H), 6.63 (s, 1H), 4.26 (s, 3H), 3.65 (s, 2H), 2.98 (m, 1H), 0.74 (m, 2H), 0.66 (m, 2H)
EXAMPLE 25




1-Methyl-4-cyclopropylamino-7-(4′-fluorophenyl)-pyrazolo[5,1-b]purine
A. 4-Fluorophenyl trimethylstannane




The title compound is prepared by the method of Example 15, part A, from p-bromo-fluorobenzene and hexamethyl-di-tin.
B. 1-Methyl-4-cyclopropylamino-7-(4′-fluorophenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and 4-Fluorophenyl trimethylstannane. ESI m/z=323.34 [(M+H)+; calcd for C17H15FN6+H: 323.14]. 1NMR d-MeOD: 7.99 (dd, J=8.81, 5.38 Hz, 2H), 7.95 (s, 1H), 7.20 (t, J=8.80 Hz, 2H), 6.78 (s, 1H), 4.32 (s, 3H), 2.92 (m, 1H), 1.10 (m, 2H), 0.89 (m, 2H)
EXAMPLE 26




1-Methyl-4-cyclopropylamino-7-(3′-fluorophenyl)-pyrazolo[5,1-b]purine
A. 3-Fluorophenyl trimethylstannane




The title compound is prepared by the method of Example 15, part A, from m-bromo-fluorobenzene and hexamethyl-di-tin. 1NMR d-CDCl3: 6.98-6.96 (m. 2H), 6.74-6.68 (m, 1H), 0.31 (s, 9H)
B. 1-Methyl-4-cyclopropylamino-7-(3′-fluorophenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and 3-fluorophenyl trimethylstannane. ESI m/z=323.27 [(M+H)+; calcd for C17H15FN6+H: 323.14]. 1NMR d-MeOD: 7.92 (s, 1H), 7.77 (d, J=7.83 Hz, 1H), 7.71 (dt, J=10.03, 1.71 Hz, 1H), 7.47 (m, 1H), 7.13 (td, J=8.07, 2.69 Hz, 1H), 6.76 (s, 1H), 4.33 (s, 3H), 2.92 (m, 1H), 1.04 (m, 2H), 0.83 (m, 2H).
EXAMPLE 27




1-Methyl-4-cyclopropylamino-7-(3′,5′-dimethoxyphenyl)-pyrazolo[5,1-b]purine
A. 3,5-Dimethoxyphenyl trimethylstannane




The title compound is prepared by the method of Example 15, part A, from 3,5-dimethoxy-bromo-benzene and hexamethyl-di-tin. 1NMR d-CDCl3: 6.62 (d, J=2.20 Hz, 2H), 6.40 (t, J=2.20 Hz, 1H), 3.80 (s, 6H), 0.28 (s, 9H).
B. 1-Methyl-4-cyclopropylamino-7-(3′,5′-dimethoxyphenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and 3,5-dimethoxyphenyl trimethylstannane. ESI m/z=365.26 [(M+H)+; calcd for C19H20N6O2+H: 365.17]. 1NMR d-CDCl3: 7.45 (s, 1H), 7.11 (d, J=2.44 Hz, 2H), 6.61 (s, 1H), 6.47 (t, J=2.20 Hz, 1H), 5.85 (s, 1H), 4.33 (s, 3H), 3.86 (s, 6H), 3.05-2.99 (m, 1H), 0.94-0.90 (m, 2H), 0.68-0.64 (m, 2H).
EXAMPLE 28




1-Methyl-4-cyclopropylamino-7-(3′,5′-dihydroxyphenyl)-pyrazolo[5,1-b]purine
Example 28 was prepared from 27B through a standard de-methylation procedure. ESI m/z=337.24 [(M+H)+; calcd for C17H16N6O2+H: 337.14]. 1NMR d-MeOD: 7.90 H (s, 1H), 6.80 (d, J=2.20 Hz, 1H), 6.61 (s, 1H), 6.22 (t, J=2.20 Hz, 1H), 4.28 (s, 3H), 2.90 (m, 1H), 1.08 (m, 2H), 0.90 (m, 2H).
EXAMPLE 29




1-Methyl-4-cyclopropylamino-7-(3′-t-butyloxycarboxamidomethyl)phenyl)-pyrazolo[5,1-b]purine
A. (3-t-Butyloxycarboxamidomethyl)phenyl trimethylstannane




The title compound is prepared by reacting the stannane from Example 19, part A, with di-t-butyl dicarbonate by a method similar to that of Example 21, part A. 1NMR d-CDCl3: 7.40-7.39 (m, 2H), 7.31 (t, J=7.58 Hz, 1H), 7.23 (d, J=7.58 Hz, 1H), 4.81 (br s, 1H), 4.30 (d, J=5.38 Hz, 2H), 1.47 (s, 9H), 0.28 (s, 9H)
B. 1-Methyl-4-cyclopropylamino-7-(3′-t-butyloxycarboxamidomethyl)phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and (3-t-butyloxycarboxamidomethyl)phenyl trimethylstannane. ESI m/z=408.14 [(M+H)+; calcd for C21H25N7O2+H: 408.21]. 1NMR d-MeOD: 7.78 (s, 1H), 7.73 (d, J=7.82 Hz, 1H), 7.65 (s, 1H), 7.32 (t, J=7.58 Hz, 1H), 7.21 (d, J=7.58 Hz, 1H), 7.15 (s, 1H), 6.39 (s, 1H), 4.27 (s, 2H), 4.19 (s, 3H), 3.03 (s, 3H), 1.46 (s, 9H)
EXAMPLE 30




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(2′′-methylpropionamidomethyl)phenyl)-pyrazolo[5,1-b]purine
A. (4-Fluoro-3-(2′-methylpropionamido)methylphenyl)trimethyl stannane




The title compound is prepared by reacting the stannane from Example 19, part A, with isobutyryl chloride by a method similar to that of Example 21, part A.
B. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(2′′-methylpropionamidomethyl)phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and (4-fluoro-3-(2′-methylpropionamido)methylphenyl)trimethyl stannane. ESI m/z=422.25 [(M+H)+; calcd for C22H24FN7O+H: 422.21]. 1NMR d-DMSO: 8.34 (t, J=5.62 Hz, 1H), 7.89 (d, J=7.34 Hz, 1H), 7.87-7.83 (m, 1H), 7.73 (d, J=3.91 Hz, 1H), 7.26 (t, J=9.05 Hz, 1H), 6.57 (s, 1H), 4.36 (d, J=5.86 Hz, 2H), 4.23 (s, 3H), 3.32 (s, 3H), 2.97 (br s, 1H), 2.52-2.48 (m, 1H), 1.09 (d, J=6.85 Hz, 6H), 0.76-0.70 (m, 2H), 0.66-0.63 (m, 2H).
EXAMPLE 31




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′cyanophenyl)-pyrazolo[5,1-b]purine
A. 2-Fluoro-3-trimethylstannylbenzonitrile




The title compound was prepared by the method of Example 15, part A, from 2-fluoro-5-bromobenzonitrile and hexamethyl-di-tin. 1NMR d-CDCl3: 7.70-7.65 (m, 2H), 7.17 (dd, J=9.79, 8.07 Hz, 1H), 0.33 (s, 9H).
B. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′cyanophenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and 2-fluoro-3-trimethylstannylbenzonitrile. ESI m/z=348.22 [(M+H)+; calcd for C18H14FN7+H: 348.14]. 1NMR d-DMSO: 8.48 (d, dd, J=6.36, 2.20 Hz, 1H), 8.37 (ddd, J=8.80, 5.38, 2.45 Hz, 1H), 7.98 (s, 1H), 7.81 (d, J=3.91 Hz, 1H), 7.64 (t, J=9.04 Hz, 1H), 6.78 (s, 1H), 4.26 (s, 3H), 2.98 (br s, 1H), 0.77-0.72 (m, 2H), 0.67-0.63 (m, 2H).
EXAMPLE 32




1-Methyl-4-cyclopropylamino-7-(3′,5′-difluorophenyl)-pyrazolo[5,1-b]purine
A. 3,5-Difluorophenyl trimethyl stannane




The title compound was prepared by the method of Example 15, part A, from 3,5-difluorobromobenzene and hexamethyl-di-tin. 1NMR d-CDCl3: 6.98-6.95 (m, 2H), 6.71 (tt, J=9.29, 2.45 Hz, 1H), 0.31 (s, 9H).
B. 1-Methyl-4-cyclopropylamino-7-(3′,5′-difluorophenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and 3,5-difluorophenyl trimethyl stannane. ESI m/z=341.24 [(M+H)+; calcd for C17H14F2N6+H: 341.13]. 1NMR d-MeOD: 7.92 (s, 1H), 7.58-7.55 (m, 1H), 6.97 (tt, J=11.25, 2.20 Hz, 1H), 6.76 (s, 1H), 4.31 (s, 3H), 2.94-2.89 (m, 1H), 1.05-1.00 (m, 2H), 0.83-0.79 (m, 2H).
EXAMPLE 33




1-Methyl-4-cyclopropylamino-7-(3′-carboxyethylphenyl)-pyrazolo[5,1-b]purine
A. Methyl 2(3′-trimethylstannyl)phenylpropionate




The title compound was prepared by the method of Example 15, part A, from methyl 2(3′-bromophenyl)propionate and hexamethyl-di-tin. 1NMR d-CDCl3: 7.34-7.30 (m, 2H), 7.26 (t, J=7.34 Hz, 1H), 7.14 (d, J=7.58 Hz, 1H), 3.67 (s, 3H), 2.94 (t, J=7.82 Hz, 2H), 2.63 (t, J=8.07 Hz, 2H), 0.27 (s, 9H).
B. 1-Methyl-4-cyclopropylamino-7-(3′-methoxycarbonylethylphenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and methyl 2(3′-trimethylstannyl)phenylpropionate.
C. 1-Methyl-4-cyclopropylamino-7-(3′-carboxyethylphenyl)-pyrazolo[5,1-b]purine




The title compound is prepared from 1-methyl-4-cyclopropylamino-7-(3′-methoxycarbonylethylphenyl)-pyrazolo[5,1-b]purine by the method of example 24. ESI m/z=377.25 [(M+H)+; calcd for C20H20N6O2+H: 377.17]. 1NMR d-MeOD: 7.82 (s, 1H), 7.80 (s, 1H), 7.77 (d, J=7.58 Hz, 1H), 7.34 (t, J=7.58 Hz, 1H), 7.23 (d, J=7.83 Hz, 1H), 6.58 (s, 1H), 4.31 (s, 3H), 2.98 (t, J=7.58 Hz, 2H), 2.90 (m, 1H), 2.65 (t, J=7.82 Hz, 2H), 0.90 (m, 2H), 0.67 (m, 2H).
EXAMPLE 34




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(1′′-methylethanesulfonamidomethyl)phenyl)-pyrazolo[5,1-b]purine
A. 3(1′-Methylethylsulfonamidomethyl)-4-fluorophenyl trimethylstannane




The title compound is prepared from 3-aminomethyl-4-fluorophenyl trimethylstannane and isopropylsulfonyl chloride by the method of Example 20, part B.
B. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′(1′′-methylethanesulfonamidomethyl)-phenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVIII and 3(1′-methylethylsulfonamidomethyl)-4-fluorophenyl trimethylstannane. ESI m/z=458.20 [(M+H)+; calcd for C21H24FN7O2S+H: 458.18]. 1NMR d-DMSO: 8.10 (d, J=7.09 Hz, 1H), 7.96 (s, 1H), 7.92-7.88 (m, 1H), 7.74 (d, J=3.66 Hz, 1H), 7.66 (t, J=6.36 Hz, 1H), 7.28 (t, J=9.54 Hz, 1H), 6.59 (s, 1H), 4.29 (d, J=6.11 Hz, 2H), 4.26 (s, 3H), 3.32 (s, 3H), 3.18-3.14 (m, 1H), 2.98 (br s, 1H), 1.24 (d, J=6.60 Hz, 6H), 0.76-0.71 (m, 2H), 0.67-0.63 (m, 2H).
EXAMPLE 35




1-Methyl-4-methylamino-7-(3′-methanesulfonamidoethylphenyl)-pyrazolo[5,1-b]purine
A. 3(2′-Aminoethyl)phenyl trimethylstannane
The title compound was prepared by the method of example 20, part A, from 3-bromo-phenethylamine and hexamethyl-di-tin.
B. 3(2′-Methanesulfonamidoethyl)phenyl trimethylstannane




The title compound was prepared by the method of example 17, part A, from 3(2′-aminoethyl)phenyl trimethylstannane and methanesulfonyl chloride.
C. 1-Methyl-4-methylamino-7-(3′-methanesulfonamidoethylphenyl)-pyrazolo[5,1-b]purine




The title compound is prepared by the method of Example 16, part B, from compound XVII and 3(2′-methanesulfonamidoethyl)phenyl trimethylstannane. ESI m/z=400.08 [(M+H)+; calcd for C18H21N7O2S+H: 400.16]. 1NMR d-MeOD: 7.91 (s, 1H), 7.89 (s, 1H), 7.84 (d, J=7.58 Hz, 1H), 7.42 (t, J=7.58 Hz, 1H), 7.32 (d, J=7.33 Hz, 1H), 6.70 (s, 1H), 4.33 (s, 3H), 3.38 (t, J=7.09 Hz, 2H), 3.22 (s, 3H), 2.94 (t, J=7.09 Hz, 2H), 2.85 (s, 3H).
EXAMPLE 36




1-Methyl-4-methylamino-7-(3′-methoxycarbonylmethylphenyl)-pyrazolo[5,1-b]purine
The title compound is prepared by the method of Example 16, part B, from compound XVII and the stannane from example 23. ESI m/z=351.09 [(M+H)+; calcd for C18H18N6O2+H: 351.16]. 1NMR d-DMSO: 7.95 (s, 1H), 7.86 (m, 2H), 7.83 (s, 1H), 7.56 (m, 1H), 7.41 (t, J=7.58 Hz, 1H), 7.26 (d, J=7.58 Hz, 1H), 6.58 (s, 1H), 4.26 (s, 3H), 3.76 (s, 3H), 3.64 (s, 3H), 2.96 (d, J=4.65 Hz, 2H).
EXAMPLE 37




1-Methyl-4-methylamino-7-(3′-carboxymethylphenyl)-pyrazolo[5,1-b]purine
The title compound is prepared by the method of Example 24 from the compound of Example 36. ESI m/z=337.06 [(M+H)+; calcd for C17H16N6O2+H: 337.14]. 1NMR d-DMSO: 7.99 (s, 1H), 7.90 (br s, 1H), 7.86 (m, 2H), 7.83 (s, 1H), 7.41 (t, J=7.58 Hz, 1H), 7.26 (d, J=7.83 Hz, 1H), 6.61 (s, 1H), 4.26 (s, 3H), 3.65 (s, 2H), 3.17 (s, 3H)
EXAMPLE 38




1-Methyl-4-methylamino-7-(3′-aminomethylphenyl)-pyrazolo[5,1-b]purine
The title compound is prepared by the method of Example 16, part B, from compound XVIII and the stannane from example 19. ESI m/z=308.15 [(M+H)+; calcd for C16H17N7+H: 308.16].
Alternate Preparation of Example 38
7-(3-(aminomethyl)phenyl)-N,1-dimethyl-1H-pyrazolo[5,1-b]purin-4-amine




Example 38
7-(3-(Aminomethyl)phenyl)-N,1-dimethyl-1H-pyrazolo[5,1-b]purin-4-amine
A mixture of Example 64 (0.303 g, 1.0 mmol), in THF was cooled to −78° C. A solution of 1M Lithium aluminium hydride (1 ml., 1.0 mmol) was slowly added over 30 minutes. After complete addition the reaction mixture was warmed to room temperature and stirred at room temperature for two hours. HPLC/LC-MS analysis showed complete conversion to the desired product. The reaction mixture was quenched sequentially with 1 ml. H2O, 1 ml. 15% NaOH, 3 ml. H2O. then filtered through Celite. The filtrate was concentrated in vacuo, and the residue purified by chromatography on Reverse-Phase PREP HPLC. The product was obtained as a white solid (0.167 g, 54%). 1H NMR (d-MeOD, 400 MHz): 8.1(s, 1H), 8.0(d, 1H), 7.90 (s, 1H), 7.5(m, 1H), 7.4 (m, 1H), 6.7(s,1H), 4.30 (s, 3H), 4.1(s, 2H), 3.2 (s, 3H). ESI m/z=307.35 [(M+H)+; calcd for C14H11N5O+H: 308]; HPLC RT=1.370 min[4 min grad, 10% MeOH/90% water to 90% MeOH/10% water]
EXAMPLE 39




1-Methyl-4-cyclopropylamino-7-(3′-fluoro-4′-methoxyphenyl)-pyrazolo[5,1-b]purine
A. 3-Fluoro-4-methoxyphenyl pinacolatoboron




A mixture of 4-bromo-2-fluoroanisole (5.3115 g, 25.8 mmol), Bis(pinacolato) diboron (9.844 g, 38.8 mmol) and KOAc (7.609 g, 77.5 mmol) was heated at 100° C. at the presence of PdCl2(dppf).CH2Cl2 (1.055 g, 1.29 mmol) in Dioxane (100 mL). After 3 h, normal EtOAc/H2O workup followed by flash chromatography (EtOAc/Hexanes, 5%) furnished compound 16 (17.02 g, 77.5%) an oil.
B. 1-Methyl-4-cyclopropylamino-7-(3′-fluoro-4′-methoxyphenyl)-pyrazolo[5,1-b]purine




A mixture of 3-fluoro-4-methoxyphenyl pinacolatoboron (75.4 mg, 0.300 mmol), XVIII (185.2 mg, 0.601 mmol), Pd(PPh3)4 (23.1 mg, 0.020 mmol) and K3PO4 (127.6 mg, 0.601 mmol) was heated at 100° C. in Dioxane/H2O (4:1, 2.0 mL). After 1.5 h, concentration followed by flash chromatography (MeOH/CH2Cl2, 5%) furnished the title compound (57.4 mg, 70%) as a white solid. LC-MS (+H):353.34; calc for C18H17FN6O+H: 353.15. 1NMR d-MeOD: 7.91 (s, 1H), 7.72 (d, J=5.14 Hz, 1H), 7.69 (s, 1H), 7.17 (t, J=8.56 Hz, 1H), 6.68 (s, 1H), 4.31 (s, 3H), 3.91 (s, 3H), 2.93-2.87 (m, 1H), 1.06-1.01 (m, 2H), 0.85-0.81 (m, 2H).
EXAMPLE 40




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-carboxyethylphenyl)-pyrazolo[5,1-b]purine
A. Methyl 3(2′-fluoro-5-bromophenyl)propionate




Compound 40A was prepared according to the above scheme.
B. 4-Fluoro-3-methoxycarbonylethylphenyl pinacolatoboron




A mixture of methyl 3(2′-fluoro-5-bromophenyl)propionate (g, mmol), bis(pinacolato)diboron (g, mmol) and KOAc (g, mmol) was heated at 100° C. at the presence of PdCl2(dppf).CH2Cl2 (g, mmol) in Dioxane (mL). After h, extractive EtOAc/H2O workup followed by flash chromatography (EtOAc/Hexanes, 5%) furnished the title compound as an oil.
C. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-methoxycarbonylethylphenyl)-pyrazolo[5,1-b]purine
Compound 40C was prepared from compound 40B and 3-fluoro-4-methoxyphenyl pinacolatoboron XVIII, by the method of Example 39, part B.
D. 1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-carboxyethylphenyl)-pyrazolo[5,1-b]purine




A mixture of 1-methyl-4-cyclopropylamino-7-(4′-fluoro-3′-methoxycarbonylethylphenyl)-pyrazolo[5,1-b]purine (57.4 mg, 0.141 mmol) in THF/MeOH/1.0 N NaOH (3.5 mL, 4:2:1) was stirred at room temperature. After 3 days, neutralization with 1.0 N HCl precipitated a white solid. Filtration followed by wash with H2O and acetone furnished the title compound (26.9 mg, 49%) as a white solid. 1H NMR (d-MeOD, 400 MHz): 7.88 (d, J=7.34 Hz, 1H), 7.83 (s, 1H), 7.86-7.80 (m, 1H), 7.12 (t, J=9.78 Hz, 1H), 6.58 (s, 1H), 4.32 (s, 3H), 3.01 (t, J=7.83 Hz, 2H), 2.90 (m, 1H), 2.65 (t, J=7.82 Hz, 2H), 0.93 (m, 2H), 0.70 (m, 2H).
EXAMPLE 41




1-Methyl-4-cyclopropylamino-7-(4′(2′H)pyranyl-pyrazolo[5,1-b]purine
A. 4-(2H)Pyranyl-pinacolatoboron




Compound 41A was prepared according to the above scheme.
B. 1-Methyl-4-cyclopropylamino-7-(4′(2′H)pyranyl-pyrazolo[5,1-b]purine




The title compound was prepared by the method of Example 39, part B, from XVIII and 4-(2H)pyranyl-pinacolatoboron. ESI m/z=311.24 [(M+H)+; calcd for C16H18N6O+H: 311.16]. 1NMR d-MeOD: 7.69 (s, 1H), 6.37 (s, 1H), 6.22 (s, 1H), 4.30-4.28 (m, 2H), 4.17 (s, 3H), 3.89 (t, J=5.63 Hz, 2H), 2.85 (7 lines, J=3.66 Hz, 1H), 2.61-2.55 (m, 2H), 0.89-0.84 (m, 2H), 0.64-0.60 (m, 2H)
EXAMPLE 42




1-Methyl-4-cyclopropylamino-7-(4′,5′-difluoro-3-methoxyphenyl)-pyrazolo[5,1-b]purine
A. 4,5-Difluoro-3-methoxycarbonylethylphenyl pinacolatoboron




The title compound was prepared by the method of Example 39, part A, from 4,5-difluoro-3-methoxybromobenzene and bis(pinacolato)diboron.
B. 1-Methyl-4-cyclopropylamino-7-(4′,5′-difluoro-3-methoxyphenyl)-pyrazolo[5,1-b]purine




The title compound was prepared by the method of Example 39, part B, from XVIII and 4,5-difluoro-3-methoxycarbonylethylphenyl pinacolatoboron. ESI m/z=371.31 [(M+H)+; calcd for C18H16F2N6O+H: 371.14]. 1NMR d-MeOD: 7.91 (s, 1H), 7.50-7.43 (m, 2H), 6.74 (s, 1H), 4.32 (s, 3H), 3.99 (s, 1H), 2.94-2.89 (m, 1H), 1.05-1.00 (m, 2H), 0.83-0.79 (m, 2H)
EXAMPLE 43




1-Methyl-4-cyclopropylamino-7-(2′,5′-difluorophenyl)-pyrazolo[5,1-b]purine
A. 2,5-Difluoro-phenyl pinacolatoboron




The title compound was prepared by the method of Example 39, part A, from 2,5-difluorobromobenzene and bis(pinacolato)diboron. 1NMR d-CDCl3: 7.59-7.50 (m, 2H), 7.17-7.10 (m, 1H), 1.33 (s, 12H).
B. 1-Methyl-4-cyclopropylamino-7-(2′,5′-difluorophenyl)-pyrazolo[5,1-b]purine




The title compound was prepared by the method of Example 39, part B, from XVIII and 2,5-difluoro-phenyl pinacolatoboron. 1NMR d-MeOD: 7.89-7.84 (m, 1H), 7.83 (s, 1H), 7.24-7.18 (m, 1H), 7.12-7.06 (m, 1H), 6.69 (d, J=4.16 Hz, 1H), 4.32 (s, 3H), 2.90 (m, 1H), 0.88 (m, 2H), 0.65 (m, 2H).
EXAMPLE 44




1-Methyl-4-cyclopropylamino-7-(3′,4′-difluorophenyl)-pyrazolo[5,1-b]purine
A. 3,4-Difluoro-phenyl pinacolatoboron




The title compound was prepared by the method of Example 39, part A, from 3,4-difluorobromobenzene and bis(pinacolato)diboron.
B. 1-Methyl-4-cyclopropylamino-7-(3′,4′-difluorophenyl)-pyrazolo[5,1-b]purine




The title compound was prepared by the method of Example 39, part B, from XVIII and 3,4-Difluoro-phenyl pinacolatoboron. 1NMR d-MeOD: 7.92 (s, 1H), 7.87 (d, J=9.79 Hz, 1H), 7.77 (apparent d, J=8.56 Hz, 1H), 7.35 (dd, J=18.34, 9.05 Hz, 1H), 6.73 (s, 1H), 4.32 (s, 3H), 2.91 (m, 1H), 1.02 (m, 2H), 0.82 (m, 2H).
EXAMPLE 45




1-Methyl-4-cyclopropylamino-7-(4′-benzyloxyphenyl)-pyrazolo[5,1-b]purine
A. 4-Benzyloxy-phenyl pinacolatoboron




The title compound was prepared by the method of Example 39, part A, from 4-benzyloxybromobenzene and bis(pinacolato)diboron.
B. 1-Methyl-4-cyclopropylamino-7-(4′-benzyloxyphenyl)-pyrazolo[5,1-b]purine




The title compound was prepared by the method of Example 39, part B, from XVIII and 4-benzyloxy-phenyl pinacolatoboron. ESI m/z=411.33 [(M+H)+; calcd for C24H22N6O+H: 411.19]. 1NMR d-MeOD: 7.89 (s, 1H), 7.86 (d, J=8.80 Hz, 2H), 7.44 (d, J=7.34 Hz, 2H), 7.36 (t, J=7.09 Hz, 2H), 7.30 (t, J=7.34 Hz, 1H), 7.06 (d, J=8.80 Hz, 2H), 6.66 (s, 1H), 5.12 (s, 2H), 4.29 (s, 3H), 2.92-2.87 (m, 1H), 1.08-1.03 (m, 2H), 0.86-0.82 (m, 2H).
EXAMPLE 46




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(1′′-morpholinecarboxamidomethyl-phenyl)-pyrazolo[5,1-b]purine




A mixture of 1-methyl-4-cyclopropylamino-7-(4′-fluoro-3′-aminomethyl-phenyl)-pyrazolo[5,1-b]purine (Example 15) (28.6 mg, 0.0814 mmol), morpholine-4-carbonylchloride (14.2 μL, 0.122 mmol) and NEt3 (50 μL, 0.359 mmol) was stirred in CHCl3 (1.0 mL) at room temperature. After 3 h, it was quenched with MeNH2 (1.0 M/THF). Concentration followed by preparative HPLC provided 22 (6.5 mg, 17%) as a white solid. 1H NMR (d-MeOD, 400 MHz): 7.91 (dd, J=6.15, 2.02 Hz, 1H), 7.88 (s, 1H), 7.83 (m, 1H), 7.15 (t, J=8.19 Hz, 1H), 6.66 (s, 1H), 4.46 (s, 2H), 4.29 (s, 3H), 3.66 (d, J=4.78 Hz, 2H), 3.41 (d, J=4.78 Hz, 2H), 3.28 (m, 1H), 1.05 (m, 2H), 0.84 (m, 2H); ESI m/z=465.32 [(M+H)+; calcd for C23H25N8O2: 465.22].
EXAMPLE 47




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(1′′-benzenesulfonamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and benzenesulfonyl chloride. ESI m/z=492.14 [(M+H)+; calcd for C24H22FN7O2S+H: 492.16]. 1NMR d-MeOD: 7.83-7.75 (m, 5H), 7.48-7.40 (m, 3H), 6.98 (t, J=9.78 Hz, 1H), 6.47 (s, 1H), 4.32 (s, 3H), 4.20 (s, 2H), 2.93-2.88 (m, 1H), 0.92-0.87 (m, 2H), 0.67-0.63 (m, 2H)
EXAMPLE 48




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(methoxycarboxamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and methyl chloroformate. ESI m/z=410.14 [(M+H)+; calcd for C20H20FN7O2+H: 410.17]. 1NMR V
EXAMPLE 49




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(benzamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and benzoyl chloride. ESI m/z=456.19 [(M+H)+; calcd for C25H22FN7O+H: 456.19]. 1NMR d-MeOD: 7.99 (dd, J=7.34, 1.96 Hz, 1H), 7.89 (dd, J=8.56, 1.47 Hz, 2H), 7.83 (ddd, J=8.56, 5.13, 2.20 Hz, 1H), 7.74 (s, 1H), 7.54 (t, J=7.34 Hz, 1H), 7.47 (t, J=7.82 Hz, 2H), 7.15 (dd, J=9.78, 8.56 Hz, 1H), 6.47 (s, 1H), 4.69 (s, 2H), 4.17 (s, 3H), 2.89-2.84 (m, 1H), 0.88-0.84 (m, 2H), 0.64-0.61 (m, 2H)
EXAMPLE 50




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(propanesulfonamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and propanesulfonyl chloride. ESI m/z=458.19 [(M+H)+; calcd for C21H24FN7O2S+H: 458.18]. 1NMR d-MeOD: 7.91 (d, J=7.34 Hz, 1H), 7.87-7.83 (m, 1H), 7.78 (s, 1H), 7.13 (t, J=8.80 Hz, 1H), 6.51 (s, 1H), 4.46 (s, 2H), 4.29 (s, 3H), 2.92-2.87 (m, 1H), 2.27 (q, J=7.58 Hz, 2H), 1.17 (t, J=7.58 Hz, 3H), 0.90-0.85 (m, 2H), 0.66-0.62 (m, 2H)
EXAMPLE 51




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(propionamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and propionyl chloride. ESI m/z=408.14 [(M+H)+; calcd for C21H22FN7O+H: 408.19]. 1NMR d-MeOD: 7.91 (d, J=7.34 Hz, 1H), 7.85 (ddd, J=8.56, 5.13, 2.20 Hz, 1H), 7.78 (s, 1H), 7.13 (dd, J=9.78, 8.80 Hz, 1H), 6.51 (s, 1H), 4.46 (s, 2H), 4.29 (s, 3H), 2.92-2.87 (m, 1H), 2.27 (q, J=7.58 Hz, 2H), 1.17 (t, J=7.58 Hz, 3H), 0.90-0.85 (m, 2H), 0.66-0.62 (m, 2H)
EXAMPLE 52




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(isopropylcarboxamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and isopropyl chloroformate. ESI m/z=438.21 [(M+H)+; calcd for C22H24FN7O2+H: 438.20]. 1NMR d-MeOD: 7.92 (d, J=8.56 Hz, 1H), 7.87-7.83 (m, 1H), 7.78 (s, 1H), 7.12 (dd, J=9.78, 8.56 Hz, 1H), 6.51 (s, 1H), 4.89-4.83 (m, 1H), 4.38 (s, 2H), 4.30 (s, 3H), 2.92-2.87 (m, 1H), 1.23 (d, J=6.11 Hz, 6H), 0.90-0.85 (m, 2H), 0.66-0.62 (m, 2H)
EXAMPLE 53




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(methoxyacetamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and methoxyacetyl chloride. ESI m/z=424.15 [(M+H)+; calcd for C21H22FN7O2+H: 424.19]. 1NMR d-MeOD: 7.91 (dd, J=7.09, 1.95 Hz, 1H), 7.85 (ddd, J=8.56, 4.89, 2.20 Hz, 1H), 7.76 (s, 1H), 7.13 (dd, J=9.78, 8.56 Hz, 1H), 6.49 (s, 1H), 4.53 (s, 2H), 4.28 (s, 3H), 3.96 (s, 2H), 3.44 (s, 3H), 2.91-2.86 (m, 1H), 0.90-0.85 (m, 2H), 0.66-0.62 (m, 2H)
EXAMPLE 54




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(cyclopropanecarboxamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and cyclopropanecarbonyl chloride. ESI m/z=420.17 [(M+H)+; calcd for C22H22FN7O+H: 420.19]. 1NMR d-MeOD: 7.91 (dd, J=7.09, 1.96 Hz, 1H), 7.85 (ddd, J=8.56, 5.14, 2.20 Hz, 1H), 7.77 (s, 1H), 7.13 (dd, J=9.78, 8.81 Hz, 1H), 6.50 (s, 1H), 4.47 (s, 2H), 4.30 (s, 3H), 2.92-2.87 (m, 1H), 1.69-1.63 (m, 1H), 0.91-0.85 (m, 4H), 0.79-0.75 (m, 2H), 0.66-0.62 (m, 2H)
EXAMPLE 55




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(dimethylaminoacetamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and dimethylaminoacetyl chloride. 1NMR d-MeOD: 7.96 (d, J=6.85 Hz, 1H), 7.94-7.91 (m, 1H), 7.89 (s, 1H), 7.20 (t, J=8.80 Hz, 1H), 6.70 (s, 1H), 4.55 (s, 2H), 4.30 (s, 3H), 3.98 (s, 2H), 2.95-2.88 (m, 7H), 1.05-1.00 (m, 2H), 0.84-0.80 (m, 2H)
EXAMPLE 56




1-Methyl-4-cyclopropylamino-7-(4′-fluoro-3′-(cyclobutanecarboxamidomethyl-phenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 46 from the compound of Example 15 and cyclobutanecarbonyl chloride. 1NMR d-MeOD: 7.90-7.83 (m, 2H), 7.88 (s, 1H), 7.16 (dd, J=9.78, 8.56 Hz, 1H), 6.66 (s, 1H), 4.45 (s, 2H), 4.28 (s, 3H), 3.28 (apparent quintet, J=1.72 Hz, 1H), 2.92-2.87 (m, 1H), 2.34-2.24 (m, 2H), 2.20-2.12 (m, 2H), 2.06-1.94 (m 1H), 1.90-1.82 (m, 1H), 1.06-1.01 (m, 2H), 0.85-0.81 (m, 2H)
EXAMPLE 57




1-Methyl-4-methylamino-7-(3′-(ureidomethyl-phenyl)-pyrazolo[5,1-b]purine




A mixture of 1-methyl-4-methylamino-7-(3′-aminomethylphenyl)-pyrazolo[5,1-b]purine, from Example 38, (11.5 mg, mmol) and KOCN (19.8 mg, mmol) in MeOH (2.0 mL) was treated with HOAc (2 drops), then stirred at room temperature for 4 h. Concentration followed by rinse with EtOAc and H2O furnished the title compound (7.9 mg, %). 1H NMR (d-MeOD, 400 MHz): 7.85 (s, 1H), 7.80 (d, J=6.78 Hz, 1H), 7.74 (s, 1H), 7.36 (t, J=8.02 Hz, 1H), 7.27 (d, J=8.01 Hz, 1H), 6.47 (s, 1H), 4.35 (s, 2H), 4.27 (s, 3H), 3.06 (s, 3H); ESI m/z=351.09 [(M+H)+; calcd for C17H18N8O+H: 351.17]
EXAMPLE 58




1-Methyl-4-methylamino-7-(3′(3′′-pyridylmethylaminocarbonylmethylphenyl)-pyrazolo[5,1-b]purine




A mixture of 1-methyl-4-methylamino-7-(3′-methoxycarbonylmethylphenyl)-pyrazolo[5,1-b]purine, from Example 36, (14.4 mg, 0.0411 mmol), 3-aminomethyl pyridine (13.3 mg, 0.123 mmol) in Dioxane (1.0 mL) was treated with AlMe3 (62 μL, 0.123 mmol) at room temperature. After stirring overnight, acidification with 1.0 N HCl followed by preparative HPLC provided the title compound (7.2 mg, 41%) as a sticky solid. 1H NMR (d-MeOD, 400 MHz): 8.44 (d, J=1, 76 Hz, 1H), 8.37 (dd, J=4.89, 1.47 Hz, 7.89 (s, 1H), 7.84 (d, J=7.83 Hz, 1H), 7.78 (s, 1H), 7.71 (d, J=8.07 Hz, 1H), 7.37 (t, J=7.58 Hz, 1H), 7.33 (dd, J=7.82, 4.89 Hz, 1H), 7.28 (d, J=7.82 Hz, 1H), 6.49 (s, 1H), 4.41 (s, 2H), 4.29 (s, 3H), 3.62 (s, 2H), 3.08 (s, 3H); ESI m/z=427.08 [(M+H)+; calcd for C23H22N8O+H: 427.20]
EXAMPLE 59




1-Methyl-4-methylamino-7-(3′(1′′-morpholinoethylaminocarbonylmethylphenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 58 from the compound of Example 36 and 2(1′-morpholinoethyl)amine. ESI m/z=449.29 [(M+H)+; calcd for C23H28N8O2+H: 449.24]. 1NMR d-MeOD: 7.96 (s, 1H), 7.93 (s, 1H), 7.90 (d, J=7.83 Hz, 1H), 7.45 (t, J=7.58 Hz, 1H), 7.37 (d, J=7.82 Hz, 1H), 6.76 (s, 1H), 4.34 (s, 3H), 4.01 (br s, 2H), 3.75 (br s, 2H), 3.66 (s, 2H), 3.61 (t, J=6.11 Hz, 2H), 3.55 (br s, 2H), 3.30 (br s, 2H), 3.24 (s, 3H), 3.15 (br s, 2H)
EXAMPLE 60




1-Methyl-4-methylamino-7-(3′(3′′-pyridylethylaminocarbonylmethylphenyl)-pyrazolo[5,1-b]purine
The title compound was prepared by the method of Example 58 from the compound of Example 36 and 2(3′-pyridylethyl)amine. ESI m/z=441.25 [(M+H)+; calcd for C24H24N8O+H: 441.21]. 1NMR d-MeOD: 8.71 (s, 1H), 8.60 (d, J=5.87 Hz, 1H), 7.96 (s, 1H), 7.88 (d, J=7.83 Hz, 1H), 7.83 (s, 1H), 7.81 (dd, J=8.07, 6.11 Hz, 1H), 7.42 (t, J=7.58 Hz, 1H), 7.26 (d, J=7.82 Hz, 1H), 6.75 (s, 1H), 4.34 (s, 3H), 3.58 (t, J=6.84 Hz, 2H), 3.51 (s, 2H), 3.25 (s, 3H), 3.05 (t, J=6.84 Hz, 2H)
EXAMPLE 61




1-Methyl-4-morpholino-7-phenyl-pyrazolo[5,1-b]purine




A mixture of IX (26.2 mg, 0.100 mmol) and POCl3 (2 mL) was stirred at 115° C. for 18 hours. The reaction mixture was concentrated in vacuo and azotroped with toluene twice, and then dried on high vacuum for about 30 min. The residue was suspended in n-butanol, added morpholine (70 uL, 0.100 mmol), and heated to 100° C. The HPLC indicated that the reaction was complete. The reaction mixture was concentrated in vacuo, extracted with EtOAc, washed with water, brine, dried over Na2SO4, and concentrated in vacuo to give a crude residue. Prep. HPLC of the residue gave the title compound as a red solid (4 mg). LC/MS (10% MeOH, 90% H20, 0.1% TFA to 90% MeOH, 10% H20, 0.1% TFA, 2 minute gradient with a Phenomenex S5 column 4.6×30 mm): [M+H]+ m/z=335.25; retention time=1.70 min.
EXAMPLE 62




1,6-Dimethyl-4-methylamino-7-phenyl-pyrazolo[5,1-b]purine
A. 4-Methyl-5-phenyl-2H-pyrazol-3-ylamine




A vial was charged with 2-Methyl-3-oxo-3-phenyl-propionitrile (1.0 g, 6.28 mmol), hydrazine (0.2 mL) and EtOH (1 mL), and subject to microwave irradiation at 100° C. for 50 min. Flach chromatography of the crude product using 3%-5% MeOH in CH2Cl2 gave the pyrazolylamine as a yellow oil (0.21 g). LC/MS (10% MeOH, 90% H20, 0.2% H3PO4 to 90% MeOH, 10% H20, 0.2% H3PO4, 2 minute gradient with an Exterra C18 S-5 column 4.6×30 mm): [M+H]+ m/z=174.10; retention time=1.02 min.
B. 1,6-Dimethyl-2-methanesulfonyl-7-phenyl-4H-pyrazolo[5,1-b]purin-4-one




Compound 62B was prepared by a method analogous to the preparation of intermediate IX, starting from compound 62A. LC/MS (10% MeOH, 90% H20, 0.2% H3PO4 to 90% MeOH, 10% H20, 0.2% H3PO4, 2 minute gradient with an Exterra C18 S-column 4.6×30 mm): [M+H]+ m/z=358.19; retention time=1.53 min.
C. 1,6-Dimethyl-7-phenyl-4H-pyrazolo[5,1-b]purin-4-one




Compound 62C was prepared by a method analogous to the preparation of intermediate X, starting from compound 62B. LC/MS (10% MeOH, 90% H20, 0.2% H3PO4 to 90% MeOH, 10% H20, 0.2% H3PO4, 2 minute gradient with an Exterra C18 S-column 4.6×30 mm): [M+H]+ m/z=280.19; retention time=1.41 min.
D. 1,6-Dimethyl-4-chloro-7-phenyl-pyrazolo[5,1-b]purine




A mixture of 62C (0.55 g, 2.00 mmol) and POCl3 (50 mL) was stirred at 115° C. for 18 hours. The reaction mixture was concentrated in vacuo and azotroped with toluene twice, and then quenched with ice, filtered and dried on high vacuum. The crude product was carried over to the next step without further purification. LC/MS (10% MeOH, 90% H20, 0.2% H3PO4 to 90% MeOH, 10% H20, 0.2% H3PO4, 2 minute gradient with an Exterra C18 S-5 column 4.6×30 mm): retention time=1.77 min.
E. 1,6-Dimethyl-4-methylamino-7-phenyl-pyrazolo[5,1-b]purine
A sealed tube was charged with 62D (20.0 mg, 0.067 mmol), diisopropylethylamine (0.75 mL), and methyl amine (5 mg, 0.067 mmol), and subject to microwave irradiation at 180° C. for 50 min. The reaction mixture was concentrated in vacuo and then triturated with MeOH, filtered to give a crude product. Prep. HPLC of the crude product gave the title compound as a solid (4.1 mg). LC/MS (10% MeOH, 90% H20, 0.2% H3PO4 to 90% MeOH, 10% H20, 0.2% H3PO4, 2 minute gradient with an Exterra C18 S-5 column 4.6×30 mm): [M+H]+ m/z=293.20; retention time=1.50 min.
EXAMPLE 63




1,6-Dimethyl-4-methylamino-7-(3-bromophenyl)-pyrazolo[5,1-b]purine
A. -5-(3-Bromophenyl)-2H-pyrazol-3-ylamine




Ten vials were each charged with 3-oxo-3-(3-bromophenyl)propionitrile (1.0 g, 4.5 mmol), hydrazine (0.2 mL) and EtOH (1 mL), and subject to microwave irradiation at 120° C. for 60 min. The contents of all vials was pooled and the solvent was evaporated in vacuo. The crude product was dissolved in ethanol (approx. 200 mL) and acidified by the addition of 4N HLC in dioxane, after 0.5 h the precipitate was collected, washed with additional ethanol and dried to yield 9.60 g. LC/MS (10% MeOH, 90% H2O, 0.2% H3PO4 to 90% MeOH, 10% H2O, 0.2% H3PO4, 2 minute gradient with an Exterra C18 S-5 column 4.6×30 mm): [M+H]+ m/z=239.0, 241.0; retention time=0.85 min.
B. 1-Methyl-2-methanesulfonyl-7-(3-bromophenyl)-4H-pyrazolo[5,1-b]purin-4-one




Compound 63B was prepared by a method analogous to the preparation of intermediate IX. Compound 63A (9.6 g, 40 mmol), intermediate VII (7.8 g, 31 mmol) and cesium carbonate (51 g, 160 mmol) were dissolved in 300 mL of DMF and heated at 100° C. for 12 h. The solvent was evaporated and the product suspended in pH 7 buffer and 1N HCL was added until the pH was approximately 7 (by pH paper). An attempt to extract the product into a mixture of ethyl acetate/THF (10:1) (300 mL) failed to disolve the majority of the material. The biphasic mixture was filtered. The solids were azeotroped with toluene to yield 10.10 g (77%) of 63B. LC/MS (10% MeOH, 90% H20, 0.2% H3PO4 to 90% MeOH, 10% H20, 0.2% H3PO4, 2 minute gradient with an Exterra C18 S-5 column 4.6×30 mm): [M+H]+ m/z=424.01; retention time=1.74 min. NMR: (DMSOd6) δ: 8.12, s, 1H; 7.96, d, (J=7 Hz), 1H; 7.59, d, (J=7 Hz), 1H; 7.42 t, (J=7 Hz) 1H; 6.50, s, 1H; 4.47, s, 3H; 3.55, s, 3H.
C. 1-Methyl-7-(3-bromophenyl)-4H-pyrazolo[5,1-b]purin-4-one




Compound 63B (100.10 g, 24 mmol) was suspended in anhydrous dioxane (100 mL) and cooled in an ice bath. LiBHEt3 (1.0M THF, 96 mL) was added via canula over a period of 5-10 min. The reaction mixture was stirred at this temperature for 1 h, and quenched by the addition of methanol. The solvent was removed in vacuo, and the residue suspended in pH 7 buffer, and and 1N HCL was added until the pH was approximately 7 (by pH paper). The solid was filtered and dried to yield 6.69 g (81%) of 63C a pale yellow solid. LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 2 minute gradient with an Phenomenex S5 column 4.6×30 mm @ 5 ml/min: 97% AP, [M+H]+ m/z=344.08, 346.08; retention time=1.69 min. NMR 400 MHz: (DMSOd6) δ: 12.09 br s, 1H; 8.12, s, 1H; 7.97-7.95, m, 2H; 7.57, d, (J=7 Hz, 1H; 7.42 t, (J=7 Hz) 1H; 6.46, s, 1H; 4.14, s, 3H.
D. 1-Methyl-4-chloro-7-(3-bromophenyl)-pyrazolo[5,1-b]purine




A mixture of 63C (5.0 g, 15 mmol) and freshly distilled POCl3 (85 mL) was stirred at 100° C. ON. The next day TLC indicated the reaction had not gone to completion. Additional POCL3 (30 mL) was added and the reation heated for an additional 48 h. The reaction mixture was concentrated in vacuo and dried under high vacuum, and then quenched with ice. When the ice melted, the product was filtered, azeotroped with toluene, and dried under high vacuum to yield 7.32 g (72%) of 63D as a tan solid. LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 2 minute gradient with an Phenomenex S5 column 4.6×30 mm @ 5 ml/min: 97% AP, [M+H]+ m/z=362.01, 364.00; retention time=1.95 min. NMR 500 MHz: (DMSOd6) δ: 8.26-8.23, m, 2H; 8.07, d, (J=7 Hz), 1H; 7.60, d, (J=7 Hz), 1H; 7.45 t, (J=7 Hz) 1H; 7.37, s, 1H; 4.31, s, 3H.
E. 1-Methyl-4-methylamino-7-(3-bromophenyl)pyrazolo[5,1-b]purine
Two vials were charged each with 63D (500.0 mg, 1.4 mmol), diisopropylethylamine (0.96 mL), methyl amine hydrochloride (93 mg, 1.4 mmol), and n-butanol (0.5 mL) and subject to microwave irradiation at 180° C. for 50 min. The contents of each vial were pooled, and the reaction mixture was concentrated in vacuo and then triturated with EtOH, filtered and dried under vacuum to yield to provide the title compound as a pale yellow solid (440 mg, 45%). LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 2 minute gradient with an Phenomenex S5 column 4.6×30 mm @ 5 mil/min: 99% AP, [M+H]+ m/z=357.08, 359.08; retention time=1.62 min. NMR 400 MHz: (DMSOd6) δ: 8.13, s, 1H; 7.97-7,95, m, 2H; 7.61, br s, 1H; 7.56, d, (J=7 Hz) 1H; 7.45 t, (J=7 Hz) 1H; 4.25, s, 3H; 2.96 d, (J=5 Hz), 1H.
EXAMPLE 64
3-(1-methyl-4-(methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)benzonitrile




Example 63
3-(1-methyl-4-(methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)benzonitrile
A mixture of Example 63 (0.500 g, 1.40 mmol), zinc cyanide (0.160 g, 1.40 mmol), tetrakistriphenylphosphine (0.530 g, 0.45 mmol) in DMF was heated at 120° C. for 10 min. under Microwave heating conditions. The reaction mixture was cooled to room temperature, diluted with ethyl acetate and filtered. The filtrate was concentrated in vacuo, and the residue purified by chromatography on Reverse-Phase PREP HPLC. The product was obtained as a white solid (17.02 g, 45%). IR: 2247 cm−1 (νCN); 1H NMR (d-MeOD, 400 MHz): 8.40 (m, 2H), 7.90 (s, 1H), 7.80 (m, 2H), 4.30 (s, 3H), 3.30 (s, 3H); ESI m/z=304.31 HPLC Ret. Time=2.610 min, [LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 4 minute gradient with a Shimadzu VP ODS 4.6×30 mm column @ 5 ml/].
EXAMPLES 65-69
Examples 65-69 were prepared by the method described for Example 63 using 63D with commercially available amines or hydrazines.
















 













Ret.


Example


Time*


#
R
ESI m/z
(min)













65




387.24,389.08
3.32


 


66




401.08,403.08
3.37


 


67




401.07,403.07
3.52


 


68




428.08,430.09
2.27


 


69




457.24,459.25
3.22





*LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 4 minute gradient with a Shimadzu VP ODS 4.6 × 30 mm column @ 5 ml/min.






EXAMPLES 70-73
Examples 70-73 were prepared by the method described for Example 64 starting with the appropriate aryl bromide described above.
















 












Example


Ret.



#
R
ESI m/z
Time*
















70




375.19
2.24



 



71




348.22
2.69



 



72




334.21
2.64



 



73a




364.39
2.54







*LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 4 minute gradient with a Shimadzu VP ODS 4.6 × 30 mm column @ 5 ml/min.



aDimethyl acetal hydrolyzed during work up.






EXAMPLE 74
N-((3-(1-methyl-4-methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)methyl)acetamide




Example 74
N-((3-(1-methyl-4-methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)methyl)acetamide
A mixture Example 38 (0.307 g, 1.0 mmol), in THF was stirred at room temperature. Pyridine (0.5 ml) was added, followed by acetic anhydride (0.5 ml, >1.0 mmol). The reaction mixture was stirred overnight at room temperature. HPLC/LC-MS analysis showed complete conversion to the desired product. The reaction mixture was concentrated in vacuo, and the residue purified by chromatography on Reverse-Phase PREP HPLC. The product was obtained as a white solid (0.285 g, 82%). 1H NMR (d-MeOD, 400 MHz): 7.9(m, 3H), 7.35(dd, 1H), 7.20 (d, 1H), 6.55(s,1H), 4.30 (s, 2H), 4.2(s, 3H), 3.2 (s, 3H). ESI m/z=350.17 [(M+H)+; calcd for C14H11N5O+H: 350]; HPLC RT=2.00 min [LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 4 minute gradient with a Shimadzu VP ODS 4.6×30 mm column @ 5 ml/min.]
EXAMPLES 75-79
Examples 75-79 were prepared by acylation of Example 38 with commercially available acid or sulfonyl chlorides as described for example 74.
















 










Example


Ret.


#
Structure
ESI m/z
Time













75




408.33
2.30


 


76




408.33
1.96


 


77




393.38
2.14


 


78




386.38
2.01


 


79




390.30
2.47









EXAMPLE 80
7-(3-(1-aminoethyl)phenyl)-N,1-dimethyl-1H-pyrazolo[5,1-b]purin-4-amine




Example 80
7-(3-(1-aminoethyl)phenyl)-N,1-dimethyl-1H-pyrazolo[5,1-b]purin-4-amine
A mixture of Example 64 (0.303 g, 1.0 mmol), in THF was stirred at room temperature. A 1M solution of methylmagnesium bromide (1 ml., 1.0 mmol) was added over 10 minutes. After complete addition the reaction mixture was heated at 60° C. for eight hours. The reaction mixture was cooled to room temperature. A 1.0M solution of lithium aluminum hydride (1.0 ml., 11.0 mmol) was added and the reaction mixture heated at reflux overnight. HPLC/LC-MS analysis showed complete conversion to the desired product. The reaction mixture was quenched sequentially with 2 ml. H20, 2 ml. 15% NaOH, 2 ml. H2O. then filtered through Celite. The filtrate was concentrated in vacuo, and the residue purified by chromatography on Reverse-Phase PREP HPLC. The product was obtained as an clear viscous liquid film (0.150 g, 46%). 1H NMR (d-MeOD, 400 MHz): 8.2(m, 2H), 8.0(s, 1H), 7.6 (m, 2H), 6.7(s,1H), 4.6 (m, 1H), 4.3(s, 3H), 3.2 (s, 3H), 1.7(d, 3H). ESI m/z=322.44, Ret. Time=1.54 min [LC/MS (10% MeOH, 90% H2O, 0.1% TFA to 90% MeOH, 10% H2O, 0.1% TFA, 4 minute gradient with a Shimadzu VP ODS 4.6×30 mm column @ 5 ml/min.]
EXAMPLE 81
(3-(1-methyl-4-(methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)phenyl)benzophenone




Example 81
(3-(1-methyl-4-(methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)phenyl)benzophenone
A mixture of Example 64 (0150 g, 1.0 mmol), in THF was stirred at room temperature. A 1.5M solution of phenylmagnesium bromide (1 ml., 1.0 mmol) was added over 10 minutes. After complete addition the reaction mixture was stirred overnight at room temperature. The reaction mixture was quenched with 6N HCl and stirred an additional two hours at room temperature. HPLC/LC-MS analysis showed complete conversion to the desired product. The reaction mixture was concentrated in vacuo, and the residue purified by chromatography on Reverse-Phase PREP HPLC. The product was obtained as a white solid. (0.090 g, 46%). 1H NMR (d-MeOD, 400 MHz): 8.4(s, 1H), 8.2(d, 1H), 7.9(s, 1H), 7.8 (m, 2H), 7.6(m, 4H), 7.4(d, 1H), 6.7(s, 1H), 4.3(s, 3H), 3.2 (s, 3H), ESI m/z=382.42 [(M+H)+; calcd for C14H11N5O+H: 383]; HPLC RT=3.273 min[4 min grad, 10% MeOH/90% water to 90% MeOH/10% water]
EXAMPLE 82
7-(3-((dimethylamino)methyl)phenyl)-N,1-dimethyl-1H-pyrazolo[5,1-b]purin-4-amine




Example 82
7-(3-((dimethylamino)methyl)phenyl)-N,1-dimethyl-1H-pyrazolo[5,1-b]purin-4-amine
A mixture of Example 38 (0.153 g, 0.5 mmol), pyridine (0.5 ml) and iodomethane (0.150 g, 1.0 mmol) in THF was stirred at room temperature overnight. HPLC/LC-MS analysis showed complete conversion to the desired product. The reaction mixture was concentrated in vacuo, and the residue purified by chromatography on Reverse-Phase PREP HPLC. The product was obtained as a tan solid (0.050 g, 30%). ESI m/z=335.61 [(M+H)+; calcd for C14H11N5O+H: 336]; HPLC RT=1.353 min[4 min grad, 10% MeOH/90% water to 90% MeOH/10% water].
EXAMPLE 83
3-(1-methyl)-4-(methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)benzamide




Example 83
3-(1-methyl)-4-(methylamino)-1H-pyrazolo[5,1-b]purin-7-yl)benzamide
A mixture of 3-(1-methyl-4-(methylamino)-1H-pyrazolo[5,1-e]purin-7-yl)benzonitrile (0.303 g, 1.0 mmol), conc. H2SO4(5 ml.) in H2O (5 ml.) was heated at approx. 90° C. for eight hours in a sealed tube. The filtrate was concentrated in vacuo, and the residue purified by chromatography on Reverse-Phase PREP HPLC. The product was obtained as an white solid (0.150 g, 46%). 1H NMR (d-MeOD, 400 MHz): 8.2(m, 2H), 8.0(s, 1H), 7.6 (m, 2H), 6.7(s,1H), 4.3(s, 3H), 3.2 (s, 3H), ESI m/z=321.34 [(M+H)+; calcd for C14H11N5O+H: 322]; HPLC RT=1.790 min[4 min grad, 10% MeOH/90% water to 90% MeOH/10% water].
EXAMPLE 84
2-(1-Methyl-7-(2-phenoxyethoxy)-1H-pyrazolo[5,1-b]purin-4-ylamino)ethanol




Example 84
Part A: 3-(2-phenoxyethoxy)-1H-pyrazol-5-amine




A mixture of 2-phenoxyethanol (56.1 g, 406 mmol), 3-amino-1H-pyrazol-5-ol (8.0648 g, 81.4 mmol) and TsOH (30.96 g, 162.8 mmol) was stirred at 130° C. under vacuum for 11 h. After cooled down to room temperature, the solid was washed with MeCN (200 mL), then treated with 6% aqueous NaHCO3 solution (500 mL). The suspension was filtered, and the solid collected was dissolved in EtOAc (100 mL), dried over MgSO4, filtered and concentrated, giving the title compound (5.4734 g, 30.7% yield). ESI m/z=220.19 [(M+1)+; calcd for C11H13N3O2+H: 220.11].
Example 84
Part B: 1-Methyl-2-(methylsulfonyl)-7-(2-phenoxyethoxy)-1H-pyrazolo[5,1-b]purin-4(5H)-one




A mixture of Example 84 part A, (2.5187 g, 11.5 mmol), intermediate VII (2.4821 g, 10.4 mmol) and Cs2CO3 (10.2085 g, 31.3 mmol) was stirred at 130° C. in DMF (anhydrous, 100 mL) under N2. After 6 h, the reaction mixture was filtered and the filtrate was concentrated under high vacuum to remove DMF. The residue was treated with pH 7 buffer solution (40 mL), then carefully neutralized with 1.0 N HCl. The precipitate was filtered and washed with H2O, acetone and EtOAc, providing the title compound (1.876 g, 44.5%) as a white solid. ESI m/z=404.13 [(M+H)+; calcd for C17H17N5O5S+H: 404.11]
Example 84
Part C: 1-Methyl-7-(2-phenoxyethoxy)-1H-pyrazolo[5,1-b]purin-4(5H)-one




A mixture of Example 84 Part B (1.8575 g, 4.60 mmol) and NiBr2(DME) (142 mg, 0.46 mmol) in DMPU (100 mL) was treated with NaBH4 (697 mg, 18.4 mmol) under stirring at room temperature. After 20 h, there was still significant amount of starting material left, therefore more NaBH4 (500 mg, 13.2 mmol) and NiBr2(DME) (1.44 g, 4.67 mmol) were added. Over the subsequent 24 h, additional NaBH4 (2.0 g, 53 mmol) and NiBr2(DME) (2.7 g, 8.75 mmol) were added to push the reaction to completion. The mixture was then quenched carefully with MeOH at ice temperature and filtered. The filtrate was neutralized with 1.0 N HCl to PH=7.0, precipitating some sticky solid. The solution layer was separated and concentrated. The residual solution was precipitated with EtOAc/hexanes to remove DMPU. The precipitated solid was purified by flash chromatography (MeOH/CHCl3, 3%), giving the title compound (658 mg, 44% yield). ESI m/z=326.25 [(M+H)+; calcd for C16H15N5O3+H: 326.13].
Example 84
Part D: 4-Chloro-1-methyl-7-(2-phenoxyethoxy)-1H-pyrazolo[5,1-b]purine




A mixture of 1-methyl-7-(2-phenoxyethoxy)-1H-pyrazolo[5,1-e]purin-4(5H)-one (611.5 mg, mmol) and PhNEt2 (598 mL) in POCl3 was heated to reflux. After 18 h, POCl3 was removed under vacuum. Normal EtOAc/saturated aqueous Na2CO3 workup, followed by flash chromatography (EtOAc) provided the title compound (365 mg, 56.6% yield). ESI m/z=344.15 [(M+H)+; calcd for C16H14ClN5O2+H: 344.09].
Example 84
Part E: 2-(1-Methyl-7-(2-phenoxyethoxy)-1H-pyrazolo[5,1-b]purin-4-ylamino)ethanol
A solution of Example 84 Part D (22.6 mg, 0.066 mmol) in 2-aminoethanol (5 mL) was heated at 100° C. for 24 h. 2-aminoethanol was then removed under vacuum, and the residue was purified by prep-HPLC, furnishing the title compound (15 mg, 62% yield). ESI m/z=369.24 [(M+H)+; calcd for C18H20N6O3+H: 369.17].
EXAMPLE 85
7-(2-(3-aminophenyl)ethynyl)-N,1-dimethyl-1H-pyrazolo[5,1-b]purin-4-amine




A mixture of intermediate XVII (79.0 mg, 0.226 mmol), 3-ethynylbenzenamine (52.8 mg, 0.451 mmol), Pd(PPh3)4 (52 mg, 0.045 mmol), CuI (8.6 mg, 0.045 mmol), and NEt3 (92 μL, 0.677 mmol) in DMF (2.0 mL) was stirred at 80° C. under N2 for 3 h. Normal EtOAc/H2O workup, followed by flash chromatography (EtOAc/Hexanes, 80:20) provided the desired compound (28.8 mg, 40.2% yield). ESI m/z=318.10 [(M+H)+; calcd for C16H12N6O+H: 318.15]
The following compounds are additionally useful as inhibitors of IKK:













Ex-





am-


Ret.


ple
Compound Structure
ESI m/z
Time


















100




338.36
1.44


 


101




380.37
1.87


 


102




422.35
2.43









The following tables contain representative examples of the present invention, and may be prepared by procedures described above, or methods familiar to one skilled in the art.















ESI
Ret.


Example
Compound Structure
m/z
Time
















86






 


87






 


88






 


89






 


90






 


91






 


92






 


93






 


94






 


95






 


96






 


97






 


98






 


99






 


103






 


104






 


105






 


106






 


107






 


108






 


109






 


110






 


111

## Claims

1. A compound of formula (I),




enantiomers, diastereomers, and salts thereof wherein
R1 is
alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1, Z2 and Z3;

R2 is
(a) hydrogen, halo, cyano,
(b) alkyl, alkenyl, alkynyl, haloalkyl, alkoxy, cycloalkoxy, heterocyclooxy, aryloxy, heteroaryloxy, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1a, Z2a, and Z3a; or
(c) —OR10a, —SR10a, or —SO2R10a 

R3 and R4 are independently
(a) hydrogen,
(b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
(c) —OR11, —NR12R13, —N(R12)C(O)R11, —N(R12)C(O)OR11, —N(R12)SO2R14, or —C(O)NR12R13, —SO2NR12R13, —N(R12)C(O)NR12aR13, or —N(R12)SO2NR12aR13; or
(d) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b, and Z3b;

R5 is
(a) hydrogen, halo, hydroxy, cyano,
(b) alkyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1c, Z2c and Z3c; or
(c) —OR7, —C(O)R7, —C(O)OR7, or —NR8R9;

R6 is
(a) hydrogen, hydroxy, halo, or cyano,
(b) alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclo, aryl, heteroaryl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d; or
(c) —OR7a, —NR8aR9a, —N(R8a)SO2R10, —N(R8a)SO2NR8bR9b, —N(R8a)C(O)R7a, —N(R8a)C(O)NR8bR9b, —N(R8a)C(O)OR7a, —C(O)R7a, —C(O)OR7a, —OC(O)R7a, —C(O)NR8aR9a, or —OC(O)NR8aR9a;

R7, R7a and R7b are independently
(a) hydrogen, or
(b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1c, Z2c and Z3c;

R8, R8a, R8b, R9 R9a and R9b are independently
(a) hydrogen,
(b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d; or
(c) —OR7b, —NR8cR9c, —N(R8c)SO2R10b, —N(R8c)C(O)R7b, —N(R8c)C(O)OR7b, —SO2NR8cR9c, —SO2R10b, —C(O)R7b, —C(O)OR7b, or C(O)NR8cR9c;

R8c and R9c are independently
(a) hydrogen,
(b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;

R10, R10a and R10b are independently alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;
R11, R12, R12a and R13 are independently
(a) hydrogen, or
(b) alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1e, Z2e and Z3e;

R14 is alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, (cycloalkyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1e, Z2e and Z3e;
Z1-1e, Z2-2e, and Z3-3e are optional substituents independently selected from
(1) Y, where Y is
(i) alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl;
(ii) a group (i) which is itself substituted by one or more of the same or different groups (i); or
(iii) a group (i) or (ii) which is independently substituted by one or more (preferably 1 to 3) of the following groups (2) to (13) of the definition of Z1,

(2) —OH or —OY1,
(3) —SH or —SY1,
(4) —C(O)tH, —C(O)tY1, or —O—C(O)Y1, where t is 1 or 2,
(5) —SO3H, or —S(O)tY1,
(6) halo,
(7) cyano,
(8) nitro,
(9) —U1—NY2Y3,
(10) —U1—N(Y1)—U2—NY2Y3,
(11) —U1—N(Y4)—U2—Y1,
(12) —U1—N(Y4)—U2—H,
(13) oxo;

U1 and U2 are each independently
(1) a single bond,
(2) —U3—S(O)t—U4—,
(3) —U3—C(O)—U4—,
(4) —U3—C(S)—U4—,
(5) —U3—O—U4—,
(6) —U3—S—U4—,
(7) —U3—O—C(O)—U4—,
(8) —U3—C(O)—O—U4—, or
(9) —U3—C(═NV1a)—U4—;

V1a is independently hydrogen, alkyl, —CN, —C(O)Y1, —S(O)2Y5, S(O)2NY2Y3;
Y1, Y2, Y3 and Y4 
(1) are each independently hydrogen or a group provided in
(i) alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl;
(ii) a group (i) which is itself substituted by one or more of the same or different groups (i),
(iii) a group (i) or (ii) which is independently substituted by one or more (preferably 1 to 3) of the following groups (1) to (12) of the definition of Z4, or

(2) Y2 and Y3 may together be alkylene or alkenylene, completing a 3- to 8-membered saturated or unsaturated ring together with the atoms to which they are attached, which ring is unsubstituted or substituted with one or more groups selected from alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl, or
(3) Y2 or Y3, together with Y1, may be alkylene or alkenylene completing a 3- to 8-membered saturated or unsaturated ring together with the nitrogen atoms to which they are attached, which ring is unsubstituted or substituted with one or more groups selected from alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl, or
(4) Y2 and Y3 together with the nitrogen atom to which they are attached may combine to form a group —N═CY5Y6 where Y5 and Y6 are each independently H or a group provided selected from alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl; and

Z4 is
(1) —OH or —OYa,
(2) —SH or —SYa,
(3) —C(O)tH, —C(O)tYa, or —O—C(O)Ya, where t is 1 or 2,
(4) —SO3H, or —S(O)tYa,
(5) halo,
(6) cyano,
(7) nitro,
(8) —U1—NYbYc,
(9) —U1—N(Y1)—U2NYbYc,
(10) —U1—N(Yd)—U2—Ya,
(11) —U1—N(Yd)—U2—H,
(12) oxo;

Ya, Yb, Yc and Yd 
(1) are each independently hydrogen or a group provided in
(i) alkyl, (hydroxy)alkyl, (alkoxy)alkyl, alkenyl, alkynyl, cycloalkyl, (cycloalkyl)alkyl, cycloalkenyl, (cycloalkenyl)alkyl, aryl, (aryl)alkyl, heterocyclo, (heterocyclo)alkyl, heteroaryl, or (heteroaryl)alkyl;


U3 and U4 are each independently
(1) a single bond,
(2) alkylene,
(3) alkenylene, or
(4) alkynylene.

2. A compound of claim 1 wherein
R3 and R4 are independently
(a) hydrogen,
(b) alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b; or
(c) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b.

3. A compound of claim 2 wherein
R6 is
(a) alkyl, alkenyl, alkynyl, heteroaryl or aryl any of which may be optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d; or
(b) —OR7a.

4. A compound of claim 3 wherein R7a is alkyl optionally substituted with Z1c.

5. A compound of claim 4 wherein
Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H;
Z1c is
(a) —OH, —OY1 or
(b) aryl optionally substituted with —OH or —OY1;

Z1d, Z2d and Z3d are optional substituents independently selected from
(a) cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y, or —N(Y4)—U2—H;
(b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H.

6. A compound of claim 5 wherein
R3 is hydrogen;
R4 is alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl, (cycloalkyl)alkyl, heterocyclo, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl any of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b;
R6 is
(a) alkynyl optionally substituted with Z1d where Z1d is aryl which may be further optionally independently substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H;
(b) aryl optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;
(c) —OR7a; or
(d) heterocyclo optionally independently substituted as valence allows with one or more Z1d, Z2d and Z3d;

Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —N(Y4)—U2—Y, or —N(Y4)—U2—H
 where
U1 is a bond,
U2 is —U3—C(O)—U4— or —U3—C(O)O—U4— and
U3 and U4 are independently a bond or alkylene;

Z1c is
(a) —OY1 where Y1 is aryl, or
(b) aryl optionally substituted with —OH or —OY1 where Y1 is alkyl;

Z1d, Z2d and Z3d are optional substituents independently selected from
(a) cyano, halo, —OH, —OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
(b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
 where
U1 is a bond, or —C(O)—,
U2 is —U3—C(O)—U4—, —U3—C(O)O—U4—, or —U3—SO2—U4—, and
U3 and U4 are independently a bond or alkylene.

7. A compound of claim 6 wherein
R1 is alkyl;
R2 is hydrogen; and
R5 is hydrogen or alkyl.

8. A compound of claim one having the formula IIa




wherein
Z1d is
(a) cyano, halo, —OH, OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
(b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
 where
U1 is a bond, or —C(O)—,
U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
U3 and U4 are independently a bond or alkylene; and


Z2d and Z3d are optional substituents independently selected from
(a) cyano, halo, —OH, OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
(b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
 where
U1 is a bond, or —C(O)—,
U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
U3 and U4 are independently a bond or alkylene.

9. A compound of claim 8 wherein
R3 and R4 are independently
(a) hydrogen,
(b) alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl and of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b; or

(c) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b.

10. A compound of claim 9 wherein
Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H.

11. A compound of claim 10 wherein
R1 is alkyl;
R2 is hydrogen; and
R5 is hydrogen or alkyl.

12. A compound of claim 1 having formula IIb




wherein
Z1d is
(a) cyano, halo, —OH, OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
(b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
 where
U1 is a bond, or —C(O)—,
U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
U3 and U4 are independently a bond or alkylene; and


Z2d and Z3d are optional substituents independently selected from
(a) cyano, halo, —OH, —OY1, —C(O)tH, —C(O)tY1, —S(O)tY1, or
(b) alkyl or alkoxy optionally substituted with one or more cyano, halo, —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —S(O)tY1, —N(Y4)—U2—Y1, or —N(Y4)—U2—H
 where
U1 is a bond, or —C(O)—,
U2 is —U3—C(O)—U4—, —U3—C(O)O—U4−, or —U3—SO2—U4—, and
U3 and U4 are independently a bond or alkylene.

13. A compound of claim 12 wherein
R3 and R4 are independently
(a) hydrogen,
(b) alkyl, haloalkyl, (hydroxy)alkyl, cycloalkyl, (cycloalkyl)alkyl, (heterocyclo)alkyl, (aryl)alkyl or (heteroaryl)alkyl and of which may be optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b; or
(c) R3 and R4 together with the nitrogen atom to which they are attached combine to form a heterocyclo ring optionally independently substituted as valence allows with one or more Z1b, Z2b and Z3b.

14. A compound of claim 13 wherein
Z1b, Z2b and Z3b are optional substituents independently selected from —OH, —OY1, —U1—NY2Y3, —C(O)tH, —C(O)tY1, —N(Y1)—U2—NY2Y3, —N(Y4)—U2—Y1, or —N(Y4)—U2—H.

15. A compound of claim 14 wherein
R1 is alkyl;
R2 is hydrogen; and
R5 is hydrogen or alkyl.

16. A pharmaceutical composition comprising (a) at least one compound according to claim 1, or a pharmaceutically acceptable salt thereof, and (b) a pharmaceutically-acceptable carrier or diluent.

17. A method of treating rheumatoid arthritis, asthma, inflammatory bowel disease, chronic obstructive pulmonary disease or psoriasis comprising administering to a mammal in need thereof a therapeutically-effective amount of at least one compound according to claim 1.